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 thinnest pa of lens capsule is: \nSelect and explain. \nA. Anterior pa, B. Posterior pa, C. Peripheral pa, D. All of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Posterior pa', 'role': 'assistant'}]