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': 'Sudden onset of hallucinations in a 35 year old man with no previous history & family history of schizophrenia may be due to - \nSelect and explain. \nA. Substance abuse, B. Schizophrenia, C. Frotterism, D. Depression', 'role': 'user'}, {'content': 'Answer: B \nExplanation: This patient has -\n\nSudden onset of hallucination\nPrevious history negative (Patient was normal before onset of hallucination)\nRelevant family history\n\nIn Schizophrenia, Sudden onset of hallucination may be the first symptom and patient may have a positive family history.\nAbout other options \n\nIn depression, there should be a history of depressive symptoms before the onset of hallucination.\nIn substance abuse, there should be a history of substance abuse.', 'role': 'assistant'}]