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': 'Punched out edge is characteristic of which type of\nulcer: \nSelect and explain. \nA. Tuberculosis, B. Rodent ulcer, C. Syphillitic, D. Non specific', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]