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': 'Acute and transient psychotic disorder, onset of symptoms ? \nSelect and explain. \nA. < 1 weeks, B. < 2 weeks, C. < 3 weeks, D. < 4 weeks', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., < 2 weeks Acute and transient psychotic disorder These psychotic disorders are characterized by an abrupt (less than 48 hours) or an acute (Less than 2 weeks) onset of symptoms. Three types have been recognized (according to ICD-10). Acute polymorphic psychotic disorder without symptoms of schizophrenia : - Hallucinations, delusions, and other psychotic symptoms are present and are varied and constantly changing, just like emotional status. None of them is consistent as to qualify for a diagnosis of schizophrenia. The polymorphic and unstable picture is characteristic of illness . Acute polymorphic psychotic disorder with symptoms of schizophrenia : - Polymorphic and unstable symptoms occur along with consistent symptoms of schizophrenia. Acute schizophrenia - like psychotic disorder : - Except for acute and shoer duration of symptoms they resemble schizophrenia in total. Symptoms occur for less than lmonth. Under DSM IV classification, it is classified as brief psychotic disorder.", 'role': 'assistant'}]