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': 'Neuroparalytic keratitis is due to which cranial nerve? \nSelect and explain. \nA. 3rd nerve, B. 5th, C. 6th, D. 7th', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 5th nerve REF: Khurana 4th ed p. 107 "Neuroparalytic keratitis is due to paralysis of sensory supply to cornea which is by trigeminal nerve\')', 'role': 'assistant'}]