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
Excitatory Neurotransmitter in CNS- 
Select and explain. 
A. Acetyl choline, B. Glycine, C. GABA, D. Glutamate
D: Glutamate
Answer: D: Glutamate 
Explanation: Glutamate is the chief excitatory neurotransmitter in CNS.