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
Drug of choice for obsessive compulsive disorder is: 
Select and explain. 
A. Clozapine, B. Alprazolam, C. Amoxapine, D. Fluoxetine
D: Fluoxetine
Answer: D: Fluoxetine 
Explanation: None