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
Tongue tastes sour from: 
Select and explain. 
A. Tip of the tongue., B. Dorsum of the tongue., C. Lateral surface of the tongue., D. Posterior of the tongue.
C: Lateral surface of the tongue.
Answer: C: Lateral surface of the tongue. 
Explanation: None