This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: ENT
vesicles over erythematous plaques in T3 dermatome region of trunk. Which of fle following would be the most likely causative or:,tn? 
Select and explain. 
A. Varicella zoster, B. Herpes simplex, C. Pox virus, D. Papilloma virus
A: Varicella zoster
Answer: A: Varicella zoster 
Explanation: Ans. a. Varicella zoster A 60-year-old male presents with painful, grouped vesicles over erythematous plaques in T dermatome region of trunk. Varicella zoster is the most likely causative organism.