This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neurotic, Stress Related and Somatoform Disorders, Subject name: Psychiatry
An obsessive compulsive neurosis patient is likely to develop: 
Select and explain. 
A. Hallucination, B. Depression, C. Delusion, D. Schizophrenia
B: Depression
Answer: B: Depression 
Explanation: Most of the patients with OCD, develop secondary depression. It is the M/C Comorbidity associated with OCD. The lifetime prevalence for major depressive disorder in persons with OCD is 67%.