This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vitreous and retina, Subject name: Ophthalmology
Strongest force of bonding b/w retina and RPE - 
Select and explain. 
A. Vitreous gel pressure, B. Intraocular fluid pressure, C. RPE water transpo, D. IPM
D: IPM
Answer: D: IPM 
Explanation: The interphotoreceptor matrix (IPM) is a highly organized structure with interconnected domains surrounding cone and rod photoreceptor cells and extends throughout the subretinal space. Based on known roles of the extracellular matrix in other tissues, the IPM is thought to have several prominent functions including serving as a receptor for growth factors, regulating retinoid transpo, paicipating in cytoskeletal organization in surrounding cells, and regulation of oxygen and nutrient transpo