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
Modern IOL is made up of –a) Acrylic acidb) PMMAc) PMLd) Silicone) Glass 
Select and explain. 
A. abc, B. abd, C. bc, D. bde
B: abd
Answer: B: abd 
Explanation: IOL are made of (i) PMIVIA (rigid IOL); (ii) Silicon, acrylic, hydrogel, collamer (foldable IOL).