This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Surgery
[{'content': 'All of the following are used in cryosurgery except- \nSelect and explain. \nA. A Liquid nitrogen, B. Argon, C. Helium, D. Carcon dioxide', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. is \'c\' i.e., Helium [Ref: style="font-size: 1.04761904761905em; font-family: Times New Roman, Times, serif; margin: 0 0 0 8px; text-indent: 0">Cryosurgeryo Cryosurgery (cryotherapy) is the use of extreme cold in surgery to destroy abnormal or diseased tissueAgent used in cryosurgery# carbon dioxide# liquid nitrogen# argon# dimethyl ether', 'role': 'assistant'}]