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: Physiology
Chemoreceptor Trigger Zone is: 
Select and explain. 
A. Pons, B. Lateral hypothalamus, C. Ventral hypothalamus, D. Area postrema
D: Area postrema
Answer: D: Area postrema 
Explanation: Area postrema