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
Which of the following is not a function of aqueous humor? 
Select and explain. 
A. Maintenance of IOP, B. Providing nutrition to retina, C. Transparency of eye, D. Drainage
B: Providing nutrition to retina
Answer: B: Providing nutrition to retina 
Explanation: 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