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': 'True aboutAutism -a) Persistent delusionb) Persistent hallucinationc) Incoordinate social interactiond) Defective reciprocal interactione) Onset after 5 yr \nSelect and explain. \nA. ab, B. cd, C. bd, D. ac', 'role': 'user'}, {'content': 'Answer: B \nExplanation: "Autism i.e., marked impairment in reciprocal, social and interpersonal interaction"....... Ahuja\nOnset of symptoms of autism is before 2.5-3 years.\nThere are no delusions or hallucinations.', 'role': 'assistant'}]