Dr. Oz says to use vinegar on a jellyfish sting.

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Question 11: The best cure for a jellyfish sting is…?
A) Urine
B) Meat tenderizer
C) Vinegar
D) Fresh water

The correct answer is C.

Dr. Oz says the best thing to do for a jellyfish sting is to wash off the affected area and then apply vinegar. "When you're stung by a jellyfish, it actually puts a little venom in you, so the best thing is to wash it off with saltwater, not fresh water, because that makes the sting worse," Dr. Oz says.

If you don't have any vinegar handy, Dr. Oz says urine can help the sting site, but it is not quite as acidic as vinegar and therefore not as helpful. "[Acidity] actually deactivates the toxin. And then if you need to, you can actually shave the site and those little specks [left by the sting] will come out, and you can pull them out if you need to."