<prompt> Autism isNeurodevelopmental disorderSocial and language communication problemMetabolic diseaseMainly due to hypothalamus damage  <response>: B Social language communication problem Autism i.e. marked impairment in reciprocal social and interpersonal interaction: Absent social smile, Lack of eye-to-eyecontact, Lack of awareness of others existence or feelings; treats people as furniture, Lack of attachment to parents and absence of separation anxiety, No or abnormal social play; prefers solitary games, Marked impairment in making friends, Lack of imitative behavior, Absence of fear in presence of danger. 