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
What is the ratio of chest compressions and breaths when a lone person is giving cardiopulmonary resuscitation? 
Select and explain. 
A. 10:01, B. 15:01, C. 30:01:00, D. 30:02:00
D: 30:02:00
Answer: D: 30:02:00 
Explanation: Ans: D. 30:2(Ref AHA 2015 CPR Guidelines " wp-content/uploads/2015/10/2015-AHA!Guidclinet.-Hilivhtv-En,cgish ficIf.)Ratio of chest compressions to rescue breath in all adults (Even with 1 or 2 rescuers) = 30:2.