This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ocular Embryology& Anatomy, Subject name: Ophthalmology
Structure with highest refractive index: 
Select and explain. 
A. Cornea, B. Lens, C. Aqueous humor, D. Vitreous humor
B: Lens
Answer: B: Lens 
Explanation: Lens - 1.41 As opposed to maximum refraction taking place at CORNEA - hence maximum Refractive Power Variable Refractive Power -LENS - due to accomodation