This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Types of Errors of Refraction, Subject name: Ophthalmology
[{'content': 'Treatment of anisometropia: \nSelect and explain. \nA. Glasses, B. Contact lens, C. Trabeculectomy, D. Trabeculoplasty', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) Contact lensRef: A.K. Khurana 6th ed. /* Anisometropic patients cannot wear glasses as it causes diplopic vision so contact lens are prescribed.* Glasses can only tolerate and correct upto 4D.* Trabeculectomy: It is a filtration surgery done in primary angle closure glaucoma.* Trabeculoplasty: Primary open angle glaucoma is treated by Trabeculoplasty.', 'role': 'assistant'}]