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': 'LASIK is used in - \nSelect and explain. \nA. Myopia, B. Hypermetropia, C. Astigmatism, D. Presbyopia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Laser in-situ keratomileusis (LASIK), Currently this procedure is being considered the refractive surgery of choice for myopia of up to - 12 D. Patient selection criteria are: \x01 Patients above 20 years of age, \x01 Stable refraction for at least 12 months. \x01 Motivated patient. \x01 Absence of corneal pathology Reference : A K KHURANA OPHTALMOLOGY,Edition 4, Page-47', 'role': 'assistant'}]