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
Infantile autism is characterized by -a) Impaired visionb) Impaired Neurobehavioural developmentc) Impaired folate leveld) A socio-economic hazarde) Parenting 
Select and explain. 
A. bd, B. d, C. ab, D. ac
A: bd
Answer: A: bd 
Explanation: Autism is a neurological disorder.                                                                 
It is more common in low socio-economic groups.