Trench Foot is also known as immersion foot.

• A. Trench Foot (immersion foot)
• B. Frostbite
• C. Frostnip
• D. Chilblain

Answer: (A)

Trench Foot is a non-freezing cold injury caused by prolonged exposure of the feet to cold, wet conditions; the name immersion foot describes feet that have been immersed in cold water for extended periods. That makes the term a direct match for the condition described. In trench foot, ongoing moisture and cold disrupt blood flow, leading to numbness, swelling, color changes, and a risk of tissue damage if not kept warm and dry.

Compare briefly with the others: frostbite is caused by freezing of the tissue and presents with pale, hard, and numb skin that may blister after thawing; frostnip is a milder freezing injury with numbness but no tissue death; chilblains are non-freezing injuries from repeated cold exposure, causing red, itchy, swollen patches.