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
True regarding non accidental traumatic fractures,all except: 
Select and explain. 
A. Costochondral joint fracture, B. Sternal fracture, C. Parietal fracture, D. Metaphyseal corner fracture
C: Parietal fracture
Answer: C: Parietal fracture 
Explanation: Parietal skull fractures are more suggestive of accidental injury.