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': 'Early morning awakening and reduced latency of REM sleep is suggestive of - \nSelect and explain. \nA. Delirium, B. Depression, C. Schizophrenia, D. Anxiety', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Early morning awakening and reduced latency of REM sleep is suggestive of depression.', 'role': 'assistant'}]