This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sclera, Subject name: Ophthalmology
Type of collagen absent in sclera ? 
Select and explain. 
A. collagen 1, B. collagen 2, C. collagen 3, D. collagen 4
B: collagen 2
Answer: B: collagen 2 
Explanation: Type 2 is absent in sclera Type 1 is predominamt type of collagen found in sclera with haphazardous arrangement of collagens CORNEA- regular arrangement of collagen bundles of Type 1 (major) and type 3 (minor) in descemet's membrane -collagen type 4 is found.