This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skin, Subject name: Medicine
What is the most likely diagnosis? 
Select and explain. 
A. Candidiasis, B. Geographic tongue, C. Herpes zoster, D. Lichen planus
C: Herpes zoster
Answer: C: Herpes zoster 
Explanation: Answer C. Herpes zoster The vesicular eruptions along the V3 trigeminal dermatome, including the left side of the tongue and mandible, are most consistent with a diagnosis of herpes zoster infection. The patient was prescribed a 2-week course of oral valacyclovir.