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
What is the treatment of choice in severe flail chest? 
Select and explain. 
A. IPPV, B. Strapping, C. Wiring, D. Nasal Oxygen
A: IPPV
Answer: A: IPPV 
Explanation: None