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
Nerve least likely to be involved in Herpes Zoster Opthalmicus is: 
Select and explain. 
A. Chorda Tympani, B. Infraorbital, C. Nasociliary, D. Lacrimal
A: Chorda Tympani
Answer: A: Chorda Tympani 
Explanation: Chorda Tympani