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
A soft contact lens is made up of – 
Select and explain. 
A. PMMA, B. HEMA, C. Glass, D. Silicone
B: HEMA
Answer: B: HEMA 
Explanation: Soft contact lenses are made up of hydroxymethylemthacrylate (HEMA).