This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Schizophrenia and other psychotic disorders, Subject name: Psychiatry
[{'content': 'Intense depression & misery without any cause is \nSelect and explain. \nA. Melancholia, B. Mania, C. Schizophrenia, D. Major depressive disorder', 'role': 'user'}, {'content': "Answer: A \nExplanation: Melancholia:- Melancholia is severe depressive state with psychomotor retardation. Ref:- Kaplan & Sadock's Synopsis of Psychiatry 10th edition; Pg num:- 1892", 'role': 'assistant'}]