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
Not used as classification for perthe's disease 
Select and explain. 
A. Catterall classification, B. Salter Thompson classification, C. Stulberg classification, D. Salter Haris Classification
D: Salter Haris Classification
Answer: D: Salter Haris Classification 
Explanation: None