## **Core Concept**
Varicella zoster virus (VZV) is a member of the herpesvirus family, which is known for causing latent infections. After a primary infection, such as chickenpox, VZV retreats to sensory nerve ganglia where it remains dormant.

## **Why the Correct Answer is Right**
The correct answer, **D. Dorsal root ganglion**, is accurate because VZV remains latent in the **dorsal root ganglia** of the sensory nerves. This location provides a sanctuary for the virus, allowing it to evade the immune system. The dorsal root ganglia are clusters of nerve cell bodies located in the dorsal roots of spinal nerves, and they play a crucial role in transmitting sensory information.

## **Why Each Wrong Option is Incorrect**
- **Option A:** The brain is not the primary site for VZV latency. While VZV can cause encephalitis, it does not remain latent in the brain.
- **Option B:** The lymph nodes are involved in the immune response to VZV but are not the site of latency.
- **Option C:** The skin is the site of VZV replication during active infections like chickenpox or shingles, but it is not where the virus remains latent.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that reactivation of latent VZV in the **dorsal root ganglion** leads to herpes zoster, commonly known as shingles. This condition is characterized by a painful rash that typically affects one dermatome.

## **Correct Answer:** D. Dorsal root ganglion.