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
[{'content': 'Nihilistic delusions are seen in -a) Endogenous depressionb) Double depressionc) Depression in invoiutional staged) Cyclothymiae) Dysthymia \nSelect and explain. \nA. ab, B. abc, C. acd, D. bcd', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Psychotic features (delusions, hallucination) can occur in endogenous depression (not in reactive / neurotic depression) and occurs later in life (involutional depression).\nMajor endogenous depression on top of dysthymia is called double depression → Psychotic features may occur.', 'role': 'assistant'}]