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
[{'content': 'Which of the following is a neurotransmitter at preganglionic area? \nSelect and explain. \nA. ATP, B. Epinephrine, C. Norepinephrine, D. Acetylcholine', 'role': 'user'}, {'content': "Answer: D \nExplanation: 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.", 'role': 'assistant'}]