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
Which is the most lateral structure passing through the
canal in the flexor retinaculum of foot 
Select and explain. 
A. Flexor digitorum longus tendon, B. Tibialis posterior tendon, C. Flexor Hallucis longus tendon, D. Posterior tibial vessels
C: Flexor Hallucis longus tendon
Answer: C: Flexor Hallucis longus tendon 
Explanation: Structure passing through the canal in the flexor retinaculum of foot ( from medial to lateral)

Tibialis posterior tendon
Flexor digitorum longus tendon
Posterior tibial vessels
The tibial nerve
Flexor Hallucis longus tendon