Explanation:

- Option 1: Perchloric acid

- Perchloric acid is a strong mineral acid and is primarily used in chemical labs.

- It is not related to ant bites.

- Option 2: Formic acid

- Formic acid is a naturally occurring acid found in ant venom.

- It is responsible for the irritation and pain from ant bites.

- Option 3: Nitric acid

- Nitric acid is a highly corrosive mineral acid used in fertilizer production.

- It is not found in ant bites.

- Option 4: Malic acid

- Malic acid is an organic acid found in various fruits.

- It is not associated with ant bites.