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
Gold standard procedure to reduce recurrence of pterygium after surgical excision is 
Select and explain. 
A. Thiotepa, B. B- radiation, C. Conjunctival autograft, D. Amniotic membrane grafting
D: Amniotic membrane grafting
Answer: D: Amniotic membrane grafting 
Explanation: Gold standard procedure to reduce recurrence of pterygium after surgical excision is amniotic membrane grafting.