This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Conjuctiva, Subject name: Ophthalmology
In pterygium, elastotic degeneration occurs in which layer: 
Select and explain. 
A. Epithelium, B. Endothelium, C. Bowmans layer, D. Descemets membrane
C: Bowmans layer
Answer: C: Bowmans layer 
Explanation: Ans. c. Bowman's layerPTERYGIUMA triangular, fibrovascular growth of degenerative subconjunctival tissue over the cornea, destroying its bowmans membrane and superficial stroma.Histologically, similar to pinguecula showing elastotic degeneration of the subconjunctival tissue with added vascularization.Pterygium showing cap, head and body and Histology shows collagenous degenerative changes in vascularized sub-epithelialstromaMost commonly seen nasally and situated always within the palpebral aperture, though it can be present temporally-also known as double pterygium.Stocker Line also seen pterygium and Fuchs islets also seen in high magnification.Stocker LinePTERYGIUM VS PINGECULA