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
Perthes disease etiology  is 
Select and explain. 
A. Pyogenic, B. Tubercular, C. Traumatic, D. Unknown
C: Traumatic
Answer: C: Traumatic 
Explanation: thought be due to an inflammatory disease secondary to trauma or some other developmental disorder.
most widely accepted theory are those involving interruption of vascular supply to femoral head.