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': 'Structure passing deep to flexor retinaculum is: \nSelect and explain. \nA. Post tibial aery, B. Long saphenous vein, C. Tibialis ant. tendon, D. Peroneus teius', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A. i.e. Posterior tibial aery', 'role': 'assistant'}]