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': 'Which of the following is the optimal position for inseing an IOL during a cataract surgery? \nSelect and explain. \nA. Anterior chamber, B. Posterior chamber, C. Iris clip, D. Any of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The lens should be placed in the capsular bag of the posterior chamber. Intraocular lens implants can easily be inseed behind the iris and in front of the posterior lens capsule. This is safest and most secure place for intraocular lens implants to rest within the eye.', 'role': 'assistant'}]