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
Fear to contamination, counting behaviours, and having to check and recheck are features characteristic of - 
Select and explain. 
A. Panic attacks, B. Agoraphobia, C. Obsessive-compulsive disorder, D. Generalized anxiety disorder
C: Obsessive-compulsive disorder
Answer: C: Obsessive-compulsive disorder 
Explanation: None