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
Obsessive Compulsive Neurosis is likely to progress into 
Select and explain. 
A. Paronia, B. Edogenous Depression, C. Secondary Depression, D. Dissociation
C: Secondary Depression
Answer: C: Secondary Depression 
Explanation: C i.e. Secondary depression In OCN failure to control ego-alien impulse leads to development of depression, as the patient is unable to control the behaviour about which he knows that it is irrational & absurd.