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
Transparency of cornea is mainly due to which layer? 
Select and explain. 
A. Endothelium, B. Descemet s membrane, C. Bowmans membrane, D. None of these
A: Endothelium
Answer: A: Endothelium 
Explanation: Ans. (a) EndotheliumRef: Khurana 4/e, p 90