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': 'A 20 years female is diagnosed to have pterygium. She does not have any clinical symptoms except for cosmetic concern. Treatment should be - \nSelect and explain. \nA. Surgical excision, B. Left alone, C. Antihistaminics, D. Antibiotics', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Asymptomatic pterygium which is not a progressive is best left alone. Reference : Parson 22nd edition page 181,182;', 'role': 'assistant'}]