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': 'Fluorescein for ophthalmological diagnosis is injected in - \nSelect and explain. \nA. Antecubital vein, B. Popliteal vein, C. Femoral vein, D. Subclavian vein', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Antecubital veinRef: Diagnostic Procedures by Nema, 2/e, p. 177The technique of fluorescein angiography comprises rapidly injecting 5 mL of 10% solution of sterile sodium fluorescein dye in the antecubital vein and taking serial photographs of the fundus.', 'role': 'assistant'}]