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': 'Ketamine is a \nSelect and explain. \nA. Short general anesthetic agent, B. Local anesthetic agent, C. Antidepressive agent, D. Hypnotic agent', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]