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
Major neurotransmitter in afferents in nucleus tractus solitarius to regulate cardiovascular system is 
Select and explain. 
A. Serotonin, B. Glutamine, C. Glycine, D. Norepinephrine
B: Glutamine
Answer: B: Glutamine 
Explanation: Vitamin is the major neurotransmitter in afferents of nucleus tractus solitarius to regulate cardiovascular system Ref: guyton and hall textbook of medical physiology 12 edition page number: 370,371,372