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: Orthopaedics
Which is the investigation of choice for a sports injury of the knee - 
Select and explain. 
A. Ultrasonography, B. Plain radiography, C. Arthrography, D. Arthroscopy
D: Arthroscopy
Answer: D: Arthroscopy 
Explanation: Investigation of choice for sports injuries of the knee is MRI.
However, amongst the given options, arthroscopy is the best.