This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Optics and refraction, Subject name: Ophthalmology
[{'content': 'Refractive surgery most commonly performed for myopia- \nSelect and explain. \nA. Radial keratotomy, B. LASIK, C. Photorefractive keratectomy, D. Lensectomy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Laser in-situ keratomileusis (LASIK). In this technique first a flap of 130-160 micron thickness of anterior corneal tissue is raised. After creating a corneal flap midstromal tissue is ablated directly with an excimer laser beam, ultimately flattening the cornea . Currently this procedure is being considered the refractive surgery of choice for myopia of up to - 12 D. Reference : A K KHURANA OPHTALMOLOGY,Edition 4,Page-47', 'role': 'assistant'}]