This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Schizophrenia Spectrum and Other Psychotic Disorders, Subject name: Psychiatry
[{'content': 'A patient is brought with 6 months history of odd behavior. There is history of a family member having disappeared some years back. He seems to be talking to himself and sometimes laughing loudly. The likely diagnosis is:- \nSelect and explain. \nA. Schizophrenia, B. Conversion disorder, C. Major depression, D. Delusional disorder', 'role': 'user'}, {'content': 'Answer: A \nExplanation: There is history of -Disorganized behavior -Hallucinations (talking to self and laughing loudly is most likely a result of patient hearing some voices and communicating with the voices) -The history of disappeared family member is again suggesting that some family member may have had a mental illness because of which either he got lost or committed suicide.All factors combined, the likely diagnosis is schizophrenia.', 'role': 'assistant'}]