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
Which of the following is a neurotransmitter at preganglionic area? 
Select and explain. 
A. ATP, B. Epinephrine, C. Norepinephrine, D. Acetylcholine
D: Acetylcholine
Answer: D: Acetylcholine 
Explanation: Ans. D AcetylcholineRef: Ganong's, 25th ed. pg. 259, 266* Acetylcholine is released at the nerve terminal of all preganglionic neuron, postganglionic parasympathetic ganglion and a few postganglionic sympathetic gangli- on(e.g.: Sweat gland and sympathetic vasodilator fibres).The remaining sympathetic postganglionic neuron release norepinephrine.