This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Pharmacology
Drug causing agranulocytosis - 
Select and explain. 
A. Pimozide, B. Clozapine, C. Risperidone, D. Olanzapine
B: Clozapine
Answer: B: Clozapine 
Explanation: Ans. is 'b' i.e., Clozapine o Agranulocytosis is a known side effect of clozapine"Because of the risk of agranulocytosis, patients, recieving clozapine must have weekly blood counts for the first 6 months and every 3 weeks thereafter "Side effects of clozapineo Agranulocytosiso Unstable BP & tachycardiao worsening of diabeteso Setsureso Urinary incontinenceo Hypersalivation (sialorrhoea)o Weight gaino Sedation