This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Physiology
Excitatory neurotransmitter of brain is? 
Select and explain. 
A. GABA, B. Aspartate, C. Glutamate, D. Glycine
C: Glutamate
Answer: C: Glutamate 
Explanation: Ans. C Glutamate* The most prevalent transmitter is glutamate, which is excitatory at well over 90% of the synapses in the human brain.* The next most prevalent is Gamma-Aminobutyric Acid, or GABA, which is inhibitory at synapses in the human brain.