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
60 year old man presents with an ulcer on lateral margin of tongue also complains of ear pain, most probable diagnosis is - 
Select and explain. 
A. Dental ulcer, B. Carcinomatous ulcer, C. Tuberculosis ulcer, D. Syphilitic ulcer
B: Carcinomatous ulcer
Answer: B: Carcinomatous ulcer 
Explanation: Ans. is 'b' i.e., Carcinomatous ulcer