This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: DNB 2018, Subject name: Microbiology
[{'content': 'Herpes zoster ophthalmicus is caused by: \nSelect and explain. \nA. VZV, B. HPV, C. HSV, D. CMV', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Zoster ophthalmicus is caused by Varicella zoster virus. It is a complication of herpes zoster. Other complications of herpes zoster are-* Post herpetic neuralgia* Ramsay hunt syndrome* Pneumonia', 'role': 'assistant'}]