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
Most metabolically active layer of Cornea is 
Select and explain. 
A. Descement membrane, B. Endothelium, C. Connective tissue stroma, D. Epithelium
B: Endothelium
Answer: B: Endothelium 
Explanation: Most metabolically active layer of Cornea is Endothelium.