This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cornea, Subject name: Ophthalmology
All of the following are true about layers of cornea except : 
Select and explain. 
A. Predescemet's layer is also known sd Dua's layer, B. Type 2 & type 4 type of collagen are present in Descement membrane, C. Corneal Stroma is the thickest layer of the cornea, D. Endothelium is responsible for maintaining relatively dehydrated state of cornea
B: Type 2 & type 4 type of collagen are present in Descement membrane
Answer: B: Type 2 & type 4 type of collagen are present in Descement membrane 
Explanation: Descement membrane: toughest layer of cornea Descement's Membrane : *Act as a basement membrane for the endothelial cells *Type 4 & type 8 are most common type of collagen in DM *Toughest layer that provides protection from perforation *Responsible for descemetocele formation. *Site of deposition of copper as KF ring in wilson's disease (. If dua layer is in option then go for that) Endothelium is responsible for behaving like a pump that maintains the relatively dehydrated state of the cornea thereby maintaining its transparency The other options are all true