This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
[{'content': 'Shingles is caused by: \nSelect and explain. \nA. VZV, B. HSV, C. CMV, D. Enterovirus 70', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. VZV.a. Varicella-zoster virus (VZV) causes two distinct clinical entities: varicella (chickenpox) and herpes zoster (shingles).b. Chickenpox, a ubiquitous and extremely contagious infection, is usually a benign illness of childhood characterized by an exanthematous vesicular rash.c. With reactivation of latent VZV (which is most common after the sixth decade of life), herpes zoster presents as a dermatomal vesicular rash, usually associated with severe pain.', 'role': 'assistant'}]