This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lens, Subject name: Ophthalmology
[{'content': 'Rollable lens is made up of - \nSelect and explain. \nA. PMMA, B. Hydrogel, C. silicone, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Rollable IOLs are ultra thin IOLs. These are implanted through 1mm incision after microincision cataract surgery(MICS). These are made of hydrogel. REF IMG', 'role': 'assistant'}]