Which of the following naturally occurring acids is present in ant sting?

Methanoic acid

The correct answer is option 3. Methanoic acid.

The acid present in an ant sting is Methanoic acid.

Methanoic acid, also known as formic acid, is the primary component of the venom in many ant species. It contributes to the burning sensation, redness, and irritation experienced after an ant sting. While the other options (lactic acid, citric acid, and oxalic acid) are also naturally occurring acids, they are not typically associated with ant stings. Therefore, methanoic acid is the correct answer.