This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Upper limb, Subject name: Anatomy
[{'content': 'Structure passing deep to flexor retinaculum is \nSelect and explain. \nA. Post tibial aery, B. Long saphenous vein, C. Tibialis anterior tendon, D. Peroneus teius', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The flexor retinaculum is a thickened band of deep fascia on the posteromedial aspect of ankle. The deep relations of flexor retinaculum from above downwards or medio laterally are tibialis posterior, flexor digitorum longus , posterior tibial aery , tibial nerve ,flexor hallucis longus. Reference: clinical anatomy for students a problem-solving approach, Neeta v Kulkarni, page no. 865', 'role': 'assistant'}]