This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
[{'content': 'Herpes zoster ophthalmicus is \nSelect and explain. \nA. Reactivation of herpes in optic nerve, B. Reactivation of herpes in trigeminal nerve, C. Reactivation of herpes in occulomotor nerve, D. herpes in immunocompromised', 'role': 'user'}, {'content': 'Answer: B \nExplanation: It is due to reactivation of herpes in ophthalmic branch of trigeminal nerve.', 'role': 'assistant'}]