**Core Concept**
The question tests knowledge of the **varicella-zoster virus** and its reactivation, which leads to **Herpes Zoster**, also known as shingles. This condition is characterized by a painful rash, usually affecting one side of the body. The **trigeminal nerve** is a common site for involvement.

**Why the Correct Answer is Right**
The most common nerve involved with Herpes Zoster is the **trigeminal nerve**, specifically the ophthalmic division, leading to **herpes zoster ophthalmicus**. This is because the varicella-zoster virus remains dormant in the **dorsal root ganglia** of the nerves, including the trigeminal nerve, after the initial chickenpox infection.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because, although other nerves can be involved, they are less common than the trigeminal nerve.
**Option B:** Incorrect as it is not typically associated with Herpes Zoster.
**Option D:** Incorrect because, while nerves can be involved, this option is not the most common.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that Herpes Zoster can lead to serious complications, such as **postherpetic neuralgia**, especially in older adults. Recognizing the early signs of Herpes Zoster, particularly in the **ophthalmic division of the trigeminal nerve**, is crucial for timely treatment.

**Correct Answer:** D. Trigeminal nerve