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
[{'content': 'What is the most common problem following surgical treament of pterygium? \nSelect and explain. \nA. Recurrence, B. Corneal ulceration, C. Astigmatism, D. Scleral scarring', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Recurrence of the pterygium after surgical excision is the most comon problem after pterigium excision and is seen in 30-50 % of the cases. Reference : AK Khurana 7th edition page.89', 'role': 'assistant'}]