This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bones Joints and Ligaments, Subject name: Anatomy
A construction worker falls feet-first from a roof. He sustains a fracture of the groove on the undersurface of the sustentaculum tali of the calcaneus bone. Which of the following muscle tendons is most likely torn? 
Select and explain. 
A. Flexor digitorum brevis, B. Flexor digitorum longus, C. Flexor hallucis brevis, D. Flexor hallucis longus
D: Flexor hallucis longus
Answer: D: Flexor hallucis longus 
Explanation: The tendon of the flexor hallucis longus muscle occupies first the groove on the posterior surface of the talus and then the groove on the undersurface of the sustentaculum tali. None of the other tendons would have been affected in such an injury.