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: Unknown
[{'content': 'Commonest site of TB spine is- \nSelect and explain. \nA. C8-T2, B. T2-T6, C. T10-L1, D. L1-L4', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans: C', 'role': 'assistant'}]