This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anaesthesia, Subject name: Anaesthesia
[{'content': 'Ketamine acts an which receptor \nSelect and explain. \nA. GABAA, B. GABAB, C. NMDA, D. Glutamate', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ketamine has multiple effects throughout the central nervous system, and it is well recognized to inhibit N-methyl-D-aspaate (NMDA) channels and neuronal hyperpolarization-activated cationic (HCN1) channels. Ref: Morgan & Mikhail's clinical anesthesiology 6e", 'role': 'assistant'}]