This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Retina, Subject name: Ophthalmology
[{'content': 'Outer blood retinal barrier is formed by \nSelect and explain. \nA. Internal limiting mebrane, B. Endothelium, C. Retinal pigment epithelium, D. Ganglion cells', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Outer blood retinal barrier is formed by retinal pigment epithelium Blood Retinal Barrier * Outer BRB: Formed by RPE * Inner BRB: Formed by endothelium of microvasculature', 'role': 'assistant'}]