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
Total number of refractive surfaces in the Eye is 
Select and explain. 
A. 2, B. 4, C. 5, D. 3
B: 4
Answer: B: 4 
Explanation: There are 4 refractive surfaces in the Eye

Anterior surface of Cornea
Posterior surface of Cornea
Anterior surface of Lens
Posterior surface of Lens