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 capsule of the crystalline lens is thinnest at: \nSelect and explain. \nA. Anterior pole, B. Posterior pole, C. Equator, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Posterior pole Lens capsule: Thickest at pre- equator region & thinnest at the posterior pole.', 'role': 'assistant'}]