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
Nihilistic delusions are seen in -a) Endogenous depressionb) Double depressionc) Depression in invoiutional staged) Cyclothymiae) Dysthymia 
Select and explain. 
A. ab, B. abc, C. acd, D. bcd
B: abc
Answer: B: abc 
Explanation: Psychotic features (delusions, hallucination) can occur in endogenous depression (not in reactive / neurotic depression) and occurs later in life (involutional depression).
Major endogenous depression on top of dysthymia is called double depression → Psychotic features may occur.