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: Dental
Bitter taste is felt at: 
Select and explain. 
A. Tip of the tongue., B. Lateral border of the tongue., C. Central portion of the tongue., D. Posterior portion of the tongue.
D: Posterior portion of the tongue.
Answer: D: Posterior portion of the tongue. 
Explanation: None