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
The epithelium is absent in lens on 
Select and explain. 
A. Anterior surface, B. Posterior surface, C. Anterior pole, D. At zonular attachment
B: Posterior surface
Answer: B: Posterior surface 
Explanation: There is no posterior epithelium, as these cells are used up in filling the central cavity of lens vesicle during The epithelium development of the lens.