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
Most common presentation of obsessive compulsive disorder in adult is 
Select and explain. 
A. Symmetry, B. Sexual thoughts, C. Pathological doubt, D. Aggression
C: Pathological doubt
Answer: C: Pathological doubt 
Explanation: Most common OCD is about contamination followed by pathological doubt.