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: Anatomy
[{'content': 'Which of the following is the most common renal vascular anomaly - \nSelect and explain. \nA. Supernumerary renal arteries, B. Supernumerary renal veins, C. Double renal arterires, D. Double renal veins', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]