This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Acute Dislocation of Patella or Knee, Subject name: Orthopaedics
Commonest dangerous complication of posterior dislocation of knee is 
Select and explain. 
A. popliteal artery injury, B. sciatic nerve injury, C. ischaemia of lower leg compartment, D. femoral artery injury
A: popliteal artery injury
Answer: A: popliteal artery injury 
Explanation: Ans. is 'a' i.e popliteal art injury