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: Pediatrics
A small boy who is brought to the emergency department by his parents is found to have a spiral fracture of the femur, with a variety of ecchymoses. What is the most likely cause of the injuries – 
Select and explain. 
A. Automobile hit – and – run accident, B. Fall from a tree, C. Child abuse, D. Fall from a bicycle
C: Child abuse
Answer: C: Child abuse 
Explanation: The fracture can occur in all the four options given in questions.
But, a variety of ecchymoses suggests child abuse -

"Bruises are the most common manifestation of child abuse and may be found on anybody surface".