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
All the following drugs are hallucinogens except 
Select and explain. 
A. Mescaline, B. Phencyclidine, C. Ketamine, D. Pentostatin
D: Pentostatin
Answer: D: Pentostatin 
Explanation: Pentostatin is an anticancer drug Hallucinogens-LSD,Phencyclidine,ketamine,mescaline etc Ref: Essentials of postgraduate psychiatry By JN Vyas 1st ed Pg. 326