Solve a riddle, get a free op

[CrackTheSky]

Ok, here's the deal; I'm going to post a riddle here. If you can give me the right answer and explain why it's the right answer, I will give one of your videos a free op. I'd prefer only people to whom I haven't given any ops to post in here, but I'm not going to be too strict about that so whatever.

Here's the riddle:

You're a treasure hunter. And you just found out about the motherlode. You know it's in a cave, but when you follow the directions on the map to where the cave is, instead of just one cave you find three. An old man is sitting by the caves, and he explains that in two of the caves are dragons that will fry you alive if you so much as step foot in them, while the remaining cave has the treasure. Beside each cave there is a sign.

The sign next to the first cave says: "The treasure is in here"
The sign next to the second cave says: "The treasure is not in here"
The sign next to the third cave says: "The treasure is in neither the first or second caves"

The old man tells you that at most, only one of the signs is true.

Which cave is the treasure in?

When you post your answer, please include a link to the video you want (potentially) oped. Realize I may take several days to a week to get your op finished, but I will do it. First person to post with the correct answer and reason WHY it's the correct answer wins the op.

Also, I am only giving away one op, but if someone else would like to post a riddle with the same kinds of rules after this one is solved, feel free.

[Greggus1]

Solved it <:l

[requiett]

The treasure is in the second. All the signs are false. They create a logical loop that can't be right any which way if one only of them are true. It was a trick to have the old man say that only one of the signs is true AT MOST.

You can keep the op.

[omegaevolution]

The treasure is in the second. All the signs are false. They create a logical loop that can't be right any which way if one only of them are true. It was a trick to have the old man say that only one of the signs is true AT MOST.

You can keep the op.

lol looks like we thought the same thing, though I had another reason that experience have taught me: "NEVER believe in the obvious signs in Video games and riddles" lol, beside that the first and the third one practically say the same thing, one is an obvious statement and the third one says that none of the other has the treasure meaning that it says "here is the treasure" which is what says in the first one .

Though experience have failed to me lots of times before (and I suck at riddles lol)

[Koopiskeva]

It's not in any of the caves. The old man is actually the treasure.

Have fun.

[Warheart]

(and I suck )

[omegaevolution]

(and I suck )

O:

[godix]

Alternate solution:
Beat up and toss the old man into the first cave. If you hear a roar and fire, you know a dragon is in there.

Capture some woodland animal. Send it to the second cave. Wait to see if there is a roar and flame.

Now by this point you either know it's in one of the first two by the lack of dragon devouring OR you know it isn't so must be in the third.

Alternatively, cave 2 because in each case if one sign is true that means another is true as well so if AT MOST only one is true then the only conclusion is none of them are. But that method doesn't have anyone dying so where's the fun in that?

[Ayanefan]

If we deduce that only 1 sign is true, then we have to say that the treasure is in the 3rd cave. This because it's impossible to have both signs 1 and 2 to be true if 3 contradicts them. If we assume that sign 3 is true, then it is true that caves 1 and 2 are false. Therefore, using XOR, cave three has the treasure.

[Emotive]

You were holding the map upside down.
If you went the other way, you would actually find one cave.
The old man is lying, there are dragons in all three caves.
Drop him in a random cave, watch him get slaughtered and turn back to take the right way.