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
A patient met with Road traffic Accident with subsequent injury to the left knee. Dial test was positive. What could be the cause: 
Select and explain. 
A. Medial Collateral Ligament Injury, B. Medial Meniscal Injury, C. Lateral Meniscus Tear, D. Posterolateral Corner Injury
D: Posterolateral Corner Injury
Answer: D: Posterolateral Corner Injury 
Explanation: D i.e. Posterolateral Corner Injury