This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Personality Disorders, Subject name: Psychiatry
In an adult patient with OCD, which is the most common obsession? 
Select and explain. 
A. Aggression, B. Pathological doubt, C. Symmetry, D. Sexual themes
B: Pathological doubt
Answer: B: Pathological doubt 
Explanation: Ans. B. Pathological doubtOC symptoms in adultsObsessions (N = 200)Contamination45Pathological doubt42Somatic36Need for symmetry31Aggressive28Sexual26Other13Multiple obsessions60Compulsions (N = 200)Checking63Washing50Counting36Need to ask or confess31Symmetry and precision28Hoarding18Multiple comparisons48