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 margin of tongue also complains of ear pain, most probable diagnosis is - \nSelect and explain. \nA. Dental ulcer, B. Carcinomatous ulcer, C. Tuberculosis ulcer, D. Syphilitic ulcer', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Carcinomatous ulcer", 'role': 'assistant'}]