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: Skin
Which of the following is the agent of choice for cryosurgery? 
Select and explain. 
A. Nitrous oxide, B. CO2 snow, C. Liquid nitrogen spray, D. Freons
C: Liquid nitrogen spray
Answer: C: Liquid nitrogen spray 
Explanation: This has a temperature of -196 c(spray/probe) & the only cryogen advocated for malignant skin lesions. Ref: Textbook of dermatosurgery & cosmetology, satish S savant, E-2,P-117.