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
All the following are "head at risk sig (radiological) that correlate positively with results in the outcome of Pehes' disease except 
Select and explain. 
A. Lateral subluxation of the femoral head, B. Speckled calcification lateral to the capital epi, C. Shallow acetabulum, D. Gage sign-a radiolucent 'V' shaped defect. Lateral epiphysis and adjacent metaphysis.
C: Shallow acetabulum
Answer: C: Shallow acetabulum 
Explanation: Shallow acetabulum A shallow acetabulum correlates poorly with outcome in congenital dislocation of hip. In addition to a, band d other 'Head at Risk' signs are diffuse metaphyseal reaction and horizontal physis.