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
The tendon running in the groove below Sustentaculum tali 
Select and explain. 
A. Tibialis posterior, B. Flexor digitoram longus, C. Flexor hallucis longus, D. Peroneus tertius
C: Flexor hallucis longus
Answer: C: Flexor hallucis longus 
Explanation: The tendon running in the groove below Sustentaculum tali.
Flexor hallucis longus