This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Psychiatry
Drug of choice for psychosis in Parkinson's disease is: 
Select and explain. 
A. Clozapine, B. Haloperidol, C. Lithium, D. Risperidone
A: Clozapine
Answer: A: Clozapine 
Explanation: If a patient with Parkinson's disease develops psychotic symptoms, the treatment becomes complicated as most of the anti psychotics cause drug induced Parkinsonism. Since clozapine has minimal extrapyramidal side effects such as parkinsonian side effects, it is preferred.