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: Unknown
In ankle sprain, the commonest ligament torn is? 
Select and explain. 
A. Tibio-talar ligament, B. Deltoid ligament, C. Posterior talo-fibular ligament, D. Anterior talo-fibular ligament
D: Anterior talo-fibular ligament
Answer: D: Anterior talo-fibular ligament 
Explanation: Ankle sprain is an inversion injury and anterior talo-fibular ligament is first to be damaged. More severe injury can also damage origin of extensor digitorum brevis and calcaneo-fibular ligament.