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: Anaesthesia
Chest compression during CPR depth: March 2013 (a, c, d, g) 
Select and explain. 
A. 1 inch, B. 2 inches, C. 3 inches, D. 4 inches
B: 2 inches
Answer: B: 2 inches 
Explanation: Ans. B i.e. 2 inches