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
[{'content': 'Pterygium all are true except: \nSelect and explain. \nA. Arise from any pa of conjunctiva, B. Can cause astigmatism, C. Surgery is treatment of choice, D. UV exposure is risk factor', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Arise from any pa of conjunctiva', 'role': 'assistant'}]