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 ncurotransmitter in brain is 
Select and explain. 
A. Ach, B. Adrenaline, C. Noradrenaline, D. Dopamine
A: Ach
Answer: A: Ach 
Explanation: (A) Ach # Acetylcholine# ACETYCHOLINE is distributed throughout the CNS, with high concentrations in the cerebral cortex, thalamus, and various nuclei in the basal forebrain.> Ach was the first neurotransmitter discovered and is the major neurotransmitter in the peripheral nervous system,> Ach is excitatory in contract to monoamine neurotransmitters which are nearly always inhibitory.> Primary monoamine neurotransmitters are dopamine, norepinephrine and serotonin.> Dopamine and epinephrine are primarily inhibitory neurotransmitters that produce arousal.