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': 'Soft contact lens is used - \nSelect and explain. \nA. High myopia, B. Astigmatism, C. Presbyopia, D. Keratoconus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Soft contact lenses are made up of HEMA (hydroxyethylmethacrylate) which is hydrophilic. These are very good for delivering higher concentrations of drugs in emergency treatment. Reference : A K KHURANA OPHTALMOLOGY,E4,Page-417,564', 'role': 'assistant'}]