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': 'All of the following result in loss of corneal sensations except: \nSelect and explain. \nA. Acute congestive glaucoma, B. Dendritic ulcer, C. Absolute glaucoma, D. Exposure keratitis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. Exposure keratitis', 'role': 'assistant'}]