This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abnormalities of Corneal Transparency, Subject name: Ophthalmology
[{'content': 'Transparency of cornea is mainly due to which layer? \nSelect and explain. \nA. Endothelium, B. Descemet s membrane, C. Bowmans membrane, D. None of these', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) EndotheliumRef: Khurana 4/e, p 90', 'role': 'assistant'}]