All are features of autistic disorder except -: (A) Mental retardation, (B) Absent social smile, (C) Onset before 21/2 years, (D) Third person hallucination
Answer is D. Mental retardation is seen in 50 - 75% of patients with autism.
There is the absence of social smile and eye to eye contact.
Onset is before 21/2 years.
Third person hallucination is characteristic of schizophrenia.