<prompt> Which of the following is a neurotransmitter at preganglionic area?ATPEpinephrineNorepinephrineAcetylcholine  <response>: Ans. D AcetylcholineRef: Ganongs, 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- one.g.: Sweat gland and sympathetic vasodilator fibres.The remaining sympathetic postganglionic neuron release norepinephrine. 