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
Drug most useful in treatment of obsessive compulsive disorder is: 
Select and explain. 
A. Flucytosine, B. Fluoxetine, C. Flourouracil, D. Finasteride
B: Fluoxetine
Answer: B: Fluoxetine 
Explanation: Fluoxetine