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: ENT
[{'content': 'Most common cranial nerve involved in CSOM is ? \nSelect and explain. \nA. V, B. VII, C. IX, D. XI', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., VII", 'role': 'assistant'}]