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
[{'content': 'The epithelium is absent in lens on \nSelect and explain. \nA. Anterior surface, B. Posterior surface, C. Anterior pole, D. At zonular attachment', 'role': 'user'}, {'content': 'Answer: B \nExplanation: There is no\xa0posterior epithelium, as these cells are used up in filling the central cavity of lens vesicle during The epithelium development of the lens.', 'role': 'assistant'}]