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
[{'content': 'The pivot test is for: \nSelect and explain. \nA. Anterior cruciate ligament, B. Posterior cruciate ligament, C. Medial meniscus, D. Lateral meniscus', 'role': 'user'}, {'content': "Answer: A \nExplanation: The pivot shift test was positive for anterior cruciate deficiency. A pivot shift demonstrates a non-functioning ACL. Ref: Surgical Techniques for the Knee By Fred D. Cushner, W. Scott, Giles R. Scuderi, 2006 ; Apley's System of Ohopaedics and Fractures, 8th Edition, Pages 705, 708", 'role': 'assistant'}]