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': 'Most common site of TB ? \nSelect and explain. \nA. Spine, B. Knee, C. Hip, D. Shoulder', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Spine Skeletal tuberculosis Tuberculous infection of bone (osteomyelitis) is a form of secondary osteomyelitis caused by hematogenous dissemination from a primary infected visceral focus. The primary focus may be active or quiescent, apparent or latent, either in the lungs, lymph glands or other viscera.", 'role': 'assistant'}]