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
Neurotrophic keratopathy is caused by – 
Select and explain. 
A. Bell's palsy, B. Facial and trigeminal nerve palsy both, C. Trigeminal nerve palsy, D. All of the above
C: Trigeminal nerve palsy
Answer: C: Trigeminal nerve palsy 
Explanation: Neuroparalytic keratitis occurs due to interruption of sensory impulses over trigeminal nerve.