This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
[{'content': 'A soft contact lens is made up of – \nSelect and explain. \nA. PMMA, B. HEMA, C. Glass, D. Silicone', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Soft contact lenses are made up of hydroxymethylemthacrylate (HEMA).', 'role': 'assistant'}]