This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thigh, Knee,Leg,Foot & Ankle injuries, Subject name: Orthopaedics
A patient met with Road Traffic Accident with injury to the left knee. Dial test was positive. What could be the cause? 
Select and explain. 
A. Medial Collateral Ligament Injury, B. Posterolateral Corner Injury, C. Lateral Meniscus Tear, D. Medial Meniscal Injury
B: Posterolateral Corner Injury
Answer: B: Posterolateral Corner Injury 
Explanation: ref : maheswari 9th ed