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: Pharmacology
Which of the following drug causes sedation but no extra pyramidal side effect: 
Select and explain. 
A. Clozapine, B. Pimozide, C. Fluphenazine, D. Haloperidol
A: Clozapine
Answer: A: Clozapine 
Explanation: None