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': '60 year old man presents with an ulcer on lateral probable diagnosis is - \nSelect and explain. \nA. Dental ulcer, B. Carcinomatous ulcer, C. Tuberculosis ulcer, D. Syphilitic ulcer', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]