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: Surgery
Ankle sprain is due to : 
Select and explain. 
A. Rupture of anterior talo-fibular ligament, B. Rupture of posterior talo-fibular ligament, C. Rupture of deltoid ligament, D. Rupture of Calcaneo-fibular ligament
A: Rupture of anterior talo-fibular ligament
Answer: A: Rupture of anterior talo-fibular ligament 
Explanation: A i.e. Rupture of anterior talo-fibular ligament