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
[{'content': 'Which of the following is the agent of choice for cryosurgery? \nSelect and explain. \nA. Nitrous oxide, B. CO2 snow, C. Liquid nitrogen spray, D. Freons', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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.', 'role': 'assistant'}]