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': "Not a premalignant ulcer ? \nSelect and explain. \nA. Bazin's ulcer, B. Pagets disease of nipple, C. Marjolin's ulcer, D. Lupus vulgaris", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Bazin's ulcer", 'role': 'assistant'}]