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: Ophthalmology
[{'content': 'Nerve least likely to be involved in Herpes Zoster Opthalmicus is: \nSelect and explain. \nA. Chorda Tympani, B. Infraorbital, C. Nasociliary, D. Lacrimal', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Chorda Tympani', 'role': 'assistant'}]