This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Introduction to Central Nervous System, Subject name: Physiology
[{'content': 'An example of "autoreceptors" in the CNS is: \nSelect and explain. \nA. NMDA receptors for, B. Nicotinic receptors for acetyl chlorine, C. Alpha2 receptors for NE, D. GABA-C receptors in retina', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Autoreceptor is a presynaptic receptor; binding of the NT with autoreceptor inhibits fuher secretion of the transmitter. a2-receptor for NE is an example of autoreceptor. NMDA receptor for glutamate is a voltage + ligand gated channel. Nicotinic AChR is a non-specific cation channel. GABA-C receptors are found exclusively in the retina; they are ionotropic receptors.', 'role': 'assistant'}]