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
Repetitive times work doing for a premonition of - 
Select and explain. 
A. Obscession, B. Compulsion, C. Anxiety, D. None
B: Compulsion
Answer: B: Compulsion 
Explanation: Repetitive irresistible thoughts → Obsession.
Repetitive purposeful behavior (work doing) → compulsion.