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
Maximum refraction takes place between 
Select and explain. 
A. Air tear film, B. Tear film and cornea, C. Cornea and aqueous, D. Aqueous lens
A: Air tear film
Answer: A: Air tear film 
Explanation: Ansa. Air tear film