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
Strongest force of bonding between retina and RPE – 
Select and explain. 
A. Vitreous gel pressure, B. Intraocular fluid pressure, C. RPE water transport, D. IPM
D: IPM
Answer: D: IPM 
Explanation: Interphotorecepter matrix (IPM) is the most important bond between the retinal pigmented epithelium (RPE) to the rest of the retina (through photoreceptor layer).