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': 'Retromammary abscess arises from? \nSelect and explain. \nA. Tuberculous rib, B. Infected hematoma, C. Chronic empyema, D. All of the above', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e. All of the above", 'role': 'assistant'}]