**Question:** The following are characteristic of autism EXCEPT:

A. Sensory processing abnormalities
B. Delayed language development
C. Oral motor abnormalities
D. Hyperactivity and impulsivity

**Core Concept:**
Autism spectrum disorder (ASD) is a neurodevelopmental disorder characterized by three core domains:
1. Social interaction and communication difficulties
2. Restricted and repetitive patterns of behavior, interests, and activities
3. Sensory processing abnormalities (including hypersensitivity and hyposensitivity to sensory stimuli)

**Why the Correct Answer is Right:**
Option D, "Hyperactivity and impulsivity," is not a characteristic feature of autism. Autism is primarily characterized by social deficits, communication challenges, and restricted behaviors. While some individuals with autism may exhibit hyperactivity and impulsivity, these symptoms are not specific to autism and can also be seen in other developmental disorders, such as attention-deficit/hyperactivity disorder (ADHD).

**Why Each Wrong Option is Incorrect:**

A. Sensory processing abnormalities are indeed a defining feature of autism. Individuals with autism often experience hypersensitivity (hyper-responsiveness) or hyposensitivity (hypo-responsiveness) to sensory stimuli, contributing to sensory processing difficulties.

B. Delayed language development is a common feature of autism, as individuals with ASD often experience challenges with acquiring, using, and understanding language.

C. Oral motor abnormalities, such as difficulty with feeding, chewing, or swallowing, can be a feature of autism. However, this option is more closely related to developmental disorders like Rett syndrome or cleft palate, which are not related to the core features of autism.

**Clinical Pearl:**
Autism is a complex and heterogeneous disorder, meaning it can manifest in various ways. While the disorder is typically diagnosed during childhood, early identification and intervention can lead to improved outcomes in social communication, behavior, and overall quality of life. Autism is a lifelong condition, and individuals with autism may require support and accommodations throughout their lives.

**Correct Answer:** B. Delayed language development

**Core Concept:** Autism is characterized by difficulties in social interaction, communication, and repetitive or restricted behaviors. Delayed language development is one of the core features of autism, as individuals with ASD often struggle with acquiring, using, and understanding language.

**Why Each Wrong Option is Incorrect:**
A. Sensory processing abnormalities are a defining feature of autism and contribute to sensory processing difficulties in individuals with ASD.
C. Oral motor abnormalities are more closely associated with developmental disorders like Rett syndrome or cleft palate and are not specific to autism.
D. Hyperactivity and impulsivity are more closely related to attention deficit/hyperactivity disorder (ADHD) and not the core features of autism.