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': "The layer of the cornea once destroyed does not regenerate is: \nSelect and explain. \nA. Epithelium, B. Bowman's membrane, C. Descemet's membrane, D. All of the above", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. Bowman's membrane", 'role': 'assistant'}]