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
Rollable lens is made up of - 
Select and explain. 
A. PMMA, B. Hydrogel, C. silicone, D. None
B: Hydrogel
Answer: B: Hydrogel 
Explanation: Rollable IOLs are ultra thin IOLs. These are implanted through 1mm incision after microincision cataract surgery(MICS). These are made of hydrogel. REF IMG