This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET Jan 2020, Subject name: Surgery
For frost-bite rewarming, the temperature should be: 
Select and explain. 
A. 20? C, B. 25? C, C. 37? C, D. 42? C
D: 42? C
Answer: D: 42? C 
Explanation: For frost-bite rewarming, the temperature should be: 40-44 degree C Gently rewarm frostbitten areas. Soak the frostbitten areas in warm water -- 104-111 degree F (40-44 DEGREE C). If a thermometer isn't available, test the water by placing an uninjured hand or elbow in it -- it should feel very warm -- not hot. Rewarming takes about 30 minutes. Stop the soaking when the skin becomes its normal colour or loses its numbness.