This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'Drugs which potentiate effect of NMDA at NMDA receptors are all except ? \nSelect and explain. \nA. Ketamine, B. Aspaic acid, C. D alanine, D. Homocysteic acid', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Ketamine Ketamine is NMDA receptor blocker so it does not potentiate the NMDA action.", 'role': 'assistant'}]