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 cause of cold abscess of chest wall is? \nSelect and explain. \nA. Pott's spine, B. TB abscesses of chest wall, C. TB of ribs, D. Intercostal lymphadenitis", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Pott's spine", 'role': 'assistant'}]