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
Ketamine acts an which receptor 
Select and explain. 
A. GABAA, B. GABAB, C. NMDA, D. Glutamate
C: NMDA
Answer: C: NMDA 
Explanation: 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