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
Neuroparalytic keratitis is due to which cranial nerve? 
Select and explain. 
A. 3rd nerve, B. 5th, C. 6th, D. 7th
B: 5th
Answer: B: 5th 
Explanation: 5th nerve REF: Khurana 4th ed p. 107 "Neuroparalytic keratitis is due to paralysis of sensory supply to cornea which is by trigeminal nerve')