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': 'Commonest site of carcinoma tongue \nSelect and explain. \nA. Apical, B. Lateral borders, C. Dorsum, D. Posterior 1/3', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Most common site is middle of the lateral border or the ventral aspect of the tongue.', 'role': 'assistant'}]