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
Structure passing deep to flexor retinaculum is 
Select and explain. 
A. Post tibial aery, B. Long saphenous vein, C. Tibialis anterior tendon, D. Peroneus teius
A: Post tibial aery
Answer: A: Post tibial aery 
Explanation: 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