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: Anatomy
[{'content': 'Tongue tastes sour from: \nSelect and explain. \nA. Tip of the tongue., B. Dorsum of the tongue., C. Lateral surface of the tongue., D. Posterior of the tongue.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]