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: Psychiatry
A patient of schizophrenia on CPZ (chlorpromazine) develops auditory hallucination again. The next drug to be given is 
Select and explain. 
A. Haloperidol, B. Clozapine, C. Suipride, D. Tianeptin
B: Clozapine
Answer: B: Clozapine 
Explanation: B i.e. Clozapine