This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Aerial disorders, Subject name: Surgery
[{'content': 'Renal collar which surrounds the aoa has its two limbs split by: \nSelect and explain. \nA. Left renal vein, B. Left renal aery, C. Isthmus of horseshoe kidney, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Renal collar The main renal vein divides and sends one limb anterior and another limb posterior to aoa to reach the IVCQ. Formed on the left side and represent persistence of the embryonic state.', 'role': 'assistant'}]