This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Glaucoma, Subject name: Ophthalmology
[{'content': 'Which of the following is not a function of aqueous humor? \nSelect and explain. \nA. Maintenance of IOP, B. Providing nutrition to retina, C. Transparency of eye, D. Drainage', 'role': 'user'}, {'content': 'Answer: B \nExplanation: It provides nutrition to the cornea and lens and not the retina. Functions of aqueous humor: Maintenance of IOP Nutrition to lens and cornea Maintaining transparency of eye Clearing the eye of toxins', 'role': 'assistant'}]