The correct answer is option 3- antiseptic.

Iodoform is a yellow, crystalline powder that has antiseptic properties. It is commonly used in wound dressings and as a disinfectant for surgical instruments. When exposed to the air, iodoform releases iodine, which has strong antimicrobial effects. Its antiseptic properties help to prevent the growth of bacteria, fungi, and other microorganisms that can cause infections.

Antipyretic (option 1) refers to a substance that reduces fever. Although iodoform has some analgesic (option 2) properties, it is not primarily used for pain relief. Similarly, while some local anesthetics may contain iodine, iodoform is not a recognized anesthetic (option 4).

Therefore, the correct answer is option 3- antiseptic.