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: Pediatrics
True about autism – 
Select and explain. 
A. Occurs in high economic striata, B. Normal communication, C. Starts before 2–3 years of age, D. More common in girls
C: Starts before 2–3 years of age
Answer: C: Starts before 2–3 years of age 
Explanation: Autism 

Autism is a neurologic disroder characterized by -


Qualitative impairment in social interaction
Qualitative impairment in communication.
Restricted repetitive and streotyped patterns of behaviour, interests, and activities.


Onset of symptoms is usually before 3 years of age.
3-5 times more common in boys, but more severe when occurs in girls.
More common among low socio-economic groups.

Clinical features

Impairment in communication
Impairment in social interaction
Inability to concentrate
Restricted repetitive and streotypes patterns of behaviour, interests and activities.
Failure to acquire speech.
Approximately 75% of children with autism are mentally retarded.
Epilepsy develops in approximately one-fifth to one-third individuals.
Half of autistic patients have abnormalties on EEG.