This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Anatomy
[{'content': 'Most common anatomocal lesion of tongue cancer is \nSelect and explain. \nA. Anterior third, B. Lateral margin, C. Dorsum, D. Posterior third', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Most of 60-70percent of cancer arise from lateral surface of middle third of tongue', 'role': 'assistant'}]