This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Substance abuse, Subject name: Psychiatry
[{'content': 'All the following drugs are hallucinogens except \nSelect and explain. \nA. Mescaline, B. Phencyclidine, C. Ketamine, D. Pentostatin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Pentostatin is an anticancer drug Hallucinogens-LSD,Phencyclidine,ketamine,mescaline etc Ref: Essentials of postgraduate psychiatry By JN Vyas 1st ed Pg. 326', 'role': 'assistant'}]