This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Conjunctiva, Subject name: Ophthalmology
Conjunctival mucosal overgrowth over cornea - 
Select and explain. 
A. Pterygium, B. Pingecula, C. Vernal keratoconjuncivitis, D. Herbe's pit
A: Pterygium
Answer: A: Pterygium 
Explanation: Pterygium is a non-cancerous (non-neoplasic) growth of conjunctiva, characterized by a wing-shaped fold of conjunctiva encroaching upon the cornea form either side within the interpalpebral fissure. Reference: AK khurana 7th edition page 89