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
Pterygium is – 
Select and explain. 
A. A vascular anomaly, B. A connective tissue degeneration, C. An inflammatory condition, D. Associated with Vitamin A deficiency
B: A connective tissue degeneration
Answer: B: A connective tissue degeneration 
Explanation: Pterygium is the degenerative condition of conjunctiva and is characterized by elastotic degeneration of subconjunctival tissue.