This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
During cryosurgery 
Select and explain. 
A. Cells get evaporated, B. Cells will not die, only freeze, C. Cell death occurs when the temperature falls below -20°C, D. Patients need general anesthesia
C: Cell death occurs when the temperature falls below -20°C
Answer: C: Cell death occurs when the temperature falls below -20°C 
Explanation: None