Frostbite occurs when body part or skin is exposed to -

Correct option is A

Sol. Frostbite occurs due to prolonged exposure to freezing temperatures, leading to tissue damage. It primarily affects fingers, toes, ears, and the nose, causing numbness, discoloration, and severe tissue damage in extreme cases. If untreated, it can lead to gangrene and require amputation.
Explanation of Each Option:
· Freezing cold temperature: Correct answer; frostbite is caused by extreme cold exposure.
· Metal injury: Incorrect; cold metal can contribute to frostbite, but it is not the primary cause.
· Insect toxin: Incorrect; does not cause frostbite but may lead to allergic reactions or infections.
· Excessive heat: Incorrect; excessive heat leads to burns, not frostbite.