Correct Answer » B Explanation

Herpes Zoster (Shingles)

Herpes zoster is caused by:

• Reactivation of Varicella-zoster virus (VZV)
• The virus remains latent in:
  • Dorsal root ganglia after primary chickenpox infection

When immunity decreases, the virus reactivates and travels along sensory nerves, producing:

• Painful vesicular eruptions
• Dermatomal distribution

Most Common Site

Thoracic dermatomes are most commonly affected

• Especially:
  • T3–L3 regions
• Thoracic involvement accounts for:
  • ~50–60% of cases

Therefore:

Thoracic region is the commonest site.

Explanation of Other Options

A. Cervical region 

• Can occur
• Less common than thoracic involvement

C. Lumbar region 

• May occur
• Less common

D. Geniculate ganglion 

• Involvement causes:
  • Ramsay Hunt syndrome
• Features:
  • Facial nerve palsy
  • Ear vesicles
  • Hearing symptoms