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
Twisting force cause: 
Select and explain. 
A. Comminuted fracture, B. Spiral fracture, C. Oblique fracture, D. None
B: Spiral fracture
Answer: B: Spiral fracture 
Explanation: A direct blow usually causes a transverse fracture and damage to the overlying skin
Crushing is more likely to cause a comminuted fracture.
Twisting causes spiral fracture.
Compression causes a short oblique fracture.
Bending results in fracture with a triangular butterfly fragment.