This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Ophthalmology
[{'content': 'Most common nerve involved in herpes zoster ophthalmicus is \nSelect and explain. \nA. Frontal, B. Lacrimal, C. Nasaciliary, D. Oculomotor', 'role': 'user'}, {'content': 'Answer: A \nExplanation: HZO is an acute infection of Gasserian ganglion of the fifth cranial nerve by the varicella-zoster virus (VZV). VZV is a DNA virus and produces acidophilic intranuclear inclusion bodies. It is neurotropic in nature. In HZO , frontal nerve is more frequently affected than the lacrimal and nasociliary nerves. Ref: khurana 6 th edition page no.104', 'role': 'assistant'}]