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: Orthopaedics
[{'content': 'Cold abscess in chest wall is most common due to - \nSelect and explain. \nA. T.B spine, B. T.B rib, C. T.B. pelvis, D. T.B pleura', 'role': 'user'}, {'content': 'Answer: A \nExplanation: It is a straight-forward question.\nMost common site of skeletal TB is spine, and pus from the Dorsal spine can travel along intercostal neurovascular bundle in the intercostal space in chest wall to form a cold abscess.', 'role': 'assistant'}]