This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infection, Subject name: Medicine
[{'content': 'What is the most likely diagnosis for this 19-month-old girl who presented with a 1-week history of an ascending erythematous eruption? \nSelect and explain. \nA. Cellulitis, B. Hand, foot, and mouth disease, C. Herpes zoster, D. Lymphadenitis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Answer C. Herpes zosterThe results of a scraping from the base of several vesicles were positive for the varicella-zoster virus. The lesions resolved within 2 weeks of treatment with acyclovir. Herpes zoster is unusual in persons younger than 10 years of age, and when it does occur in this age group, the lesions have a predilection for dermatomes supplied by the cervical and sacral nerves.', 'role': 'assistant'}]