This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Trauma, Subject name: Surgery
What is flail chest? 
Select and explain. 
A. Fracture of three or more ribs at 2 or more places, B. Fracture of 2 ribs at three places, C. Ventilator associated pneumonia, D. Transfusion associated lung injury
A: Fracture of three or more ribs at 2 or more places
Answer: A: Fracture of three or more ribs at 2 or more places 
Explanation: Ans. (a) Fracture of three or more ribs at 2 or more placesRef: Bailey 26th edition Page 355* Flail chest is defined as three or more ribs fractured in two or more places