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
Compound fracture is 
Select and explain. 
A. Fracture with aery involvement, B. Fracture with nerve involvement, C. Fracture with muscle involvement, D. Fracture with skin involvement
D: Fracture with skin involvement
Answer: D: Fracture with skin involvement 
Explanation: D i.e. Fracture with skin involvement