Which acid is present in ant sting?

An ant's bite injects an acidic substance into the victim's skin, resulting in a burning sensation. Any simple salt that is readily available can be applied to the sting to counteract its effects.

Ethanoic acid commonly known as acetic acid is found in vinegar.

Butanoic acid is found in butter and cheese.

Methanoic acid is commonly called formic acid. "Formica" is a Latin word meaning ant. Thus formic acid is injected into our body when an ant stings. Thus the pH change on the skin causes itching and irritation. Corrosive formic acid solutions are strong solutions. Any portion of the body could become burned if there is contact. Drooling, trouble swallowing, vomiting, burns to the lips, throat, and stomach, and formic acid ingestion is all possible side effects. Formic acid is an anti-inject acid that burns when injected. Applying turmeric or a moderate base, such as baking soda, can help soothe the pain brought on by an ant sting.

Hence, option A is correct.