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
[{'content': 'MC type of carcinoma anal canal \nSelect and explain. \nA. Adenocarcinoma, B. SCC, C. Basal cell carcinoma, D. Hamartoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: MC type anal carcinoma is SCC > BCC.', 'role': 'assistant'}]