This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Child psychiatry, Subject name: Psychiatry
All are true about autism except 
Select and explain. 
A. 2/3rd are mentally retarded, B. Language is impaired, C. Abnormal dermatoglyphics, D. Poor eye contact
A: 2/3rd are mentally retarded
Answer: A: 2/3rd are mentally retarded 
Explanation: About 30% of children with Autism function in the intellectually disabled range. Among them, 30% are in mild to moderate range and about 45 to 50% are in severly to profound range. Children with Autism have been observed to have a higher incidence of abnormal dermatographics (fingerprints) than those in the general population. This finding might suggest a disturbance in neuro ectodermal development. Ref: Synopsis of Psychiatry, 11e, pg 1156, 1157.