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
Autistic disorder is characterized by all of the following , except: 
Select and explain. 
A. Visual impairment, B. Lack of social Interaction, C. Stereotypical movements, D. Delayed development of speech
A: Visual impairment
Answer: A: Visual impairment 
Explanation: Autism is a pervasive developmental disorder characterized by impairment of social interaction. Other characteristic features of this disorder are repetitive motor activities or obsessions and impairment in verbal and nonverbal communication. It is not associated with visual impairment.Ref: Emergency Medical Technician Transition Manual By American Academy of Ohopaedic Surgeons, page 326.