## **Core Concept**
Tourette syndrome is a neurodevelopmental disorder characterized by repetitive movements and vocalizations. It falls under the category of tic disorders. The condition is named after Georges Gilles de la Tourette.

## **Why the Correct Answer is Right**
Tourette syndrome is indeed a type of **tic disorder**. Tic disorders are characterized by the presence of tics, which are sudden, repetitive movements (motor tics) or sounds (vocal tics). In Tourette syndrome, both motor and vocal tics are present, occurring multiple times per day, nearly every day, or intermittently for more than a year since the first tic onset. The exact cause of Tourette syndrome is not fully understood, but it is believed to involve a combination of genetic and environmental factors affecting brain regions such as the **basal ganglia** and the **prefrontal cortex**.

## **Why Each Wrong Option is Incorrect**
- **Option A:** While anxiety and stress can exacerbate symptoms of Tourette syndrome, it is not classified as an anxiety disorder. Anxiety disorders are characterized by excessive fear or anxiety that interferes with daily life.
- **Option B:** Tourette syndrome is not primarily considered a **movement disorder** like Parkinson's disease or Huntington's disease, although it does involve abnormal movements (tics).
- **Option C:** It is not categorized under **obsessive-compulsive disorder (OCD)**, although there is a significant overlap between the two conditions. Some individuals with Tourette syndrome have co-occurring OCD.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that Tourette syndrome often presents with a combination of **motor tics** (like blinking, facial grimacing) and **vocal tics** (like grunting, repeating words). The condition typically begins in childhood, with the average onset age being around 5-7 years.

## **Correct Answer:** D. Tic disorder.