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: Unknown
[{'content': 'The thinnest part of the lens capsule is? \nSelect and explain. \nA. Anterior pole, B. Posterior pole, C. Posterior capsule, D. Apex', 'role': 'user'}, {'content': 'Answer: B \nExplanation: ANSWER: B', 'role': 'assistant'}]