<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 3-year-old girl is brought to the pediatrician by her parents who are concerned that she is not developing normally. They say she does not talk and avoids eye contact. She prefers to sit and play with blocks by herself rather than engaging with other children. They also note that she will occasionally have violent outbursts in inappropriate situations. She is otherwise healthy. In the office, the patient sits quietly in the corner of the room stacking and unstacking blocks. Examination of the patient shows a well-developed female with no physical abnormalities. Which of the following is the most likely diagnosis in this patient?? A: Autism spectrum disorder, B: Cri-du-chat syndrome, C: Fragile X syndrome, D: Oppositional defiant disorder, E: Rett syndrome,  <response>: This question describes a 3-year-old girl with impaired social interaction and communication skills, as evidenced by lack of speech, poor eye contact, and preference for solitary play. She also exhibits restricted interests and repetitive behaviors like stacking blocks. The description of violent outbursts in inappropriate situations could indicate problems with emotional regulation. Based on these symptoms, the most likely diagnosis is an autism spectrum disorder. Cri-du-chat syndrome, Fragile X syndrome, and Rett syndrome are genetic disorders that can present with autistic features but are less likely given the lack of dysmorphic features or intellectual disability noted on exam. Oppositional defiant disorder also does not explain the core social and communication deficits described.A: Autism spectrum disorder 