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
Cotton's fracture is 
Select and explain. 
A. Avulsion fracture of C7, B. Trimaoleolar, C. Bimalleolar, D. Burst fracture of atlas
B: Trimaoleolar
Answer: B: Trimaoleolar 
Explanation: B i.e. Trimalleolar