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': 'In retinal artery angiogram, the dye is injected through the: \nSelect and explain. \nA. Peripheral veins, B. Aorta, C. Retinal artery, D. Retinal vein', 'role': 'user'}, {'content': 'Answer: A \nExplanation: a) peripheral veins ref: khurana 3rd/e p.39', 'role': 'assistant'}]