This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lens, Subject name: Ophthalmology
Epithelium is absent in lens on - 
Select and explain. 
A. Anterior surface, B. Anterior pole, C. Posterior surface, D. At zonular attachment
C: Posterior surface
Answer: C: Posterior surface 
Explanation: There is no posterior epithelium, as these cells are used up in filling the central cavity of lens vesicle during development of the lens.