This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cornea and sclera, Subject name: Ophthalmology
[{'content': "Neurotrophic keratopathy is caused by \nSelect and explain. \nA. Bell's palsy, B. Trigeminal palsy, C. Both trigeminal and facial palsy together only, D. Trochlear nerve palsy", 'role': 'user'}, {'content': "Answer: B \nExplanation: *This occurs in some cases in which the trigeminal nerve is paralyzed, typically as a result of radical treatment for trigeminal neuralgia. *The characteristic feature of neurotrophic keratopathy is the desquamation of the corneal epithelium. The surface of the cornea becomes dull and the epithelium is thrown off. *The entire epithelium may thus peel off intact. The substantia propria then becomes cloudy and finally yellow, breaking down into a large ulcer which is usually accompanied by a hypopyon. *There is no pain, owing to the anesthesia, but ciliary Injection is marked. Neurotrophic keratopathy is a degenerative corneal disease induced by an impairment of trigeminal nerve. Impairment of loss of corneal sensory innervation is responsible for corneal epithelial defects, ulcer, and perforation. Ref Parsons' 21st edition; Pg.115", 'role': 'assistant'}]