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
Exsanguinating blood loss in? 
Select and explain. 
A. Closed humerus fracture, B. Closed tibia fracture, C. Open femur fracture, D. Open humerus fracture
C: Open femur fracture
Answer: C: Open femur fracture 
Explanation: Ans. is 'c' i.e., Open femur fracture