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 Neurotransmitters are : 
Select and explain. 
A. Acetyl choline, B. Glycine, C. GABA, D. Glutamine
D: Glutamine
Answer: D: Glutamine 
Explanation: D i.e. Glutamate