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
Patient on dental chair during extraction becomes unconscious; patient is breathing but not responsive. Your first step will be: 
Select and explain. 
A. Recline chair and shout for help and give oxygen, B. Check BP and pulse and intubate, C. Start CPR immediately, D. ECG
A: Recline chair and shout for help and give oxygen
Answer: A: Recline chair and shout for help and give oxygen 
Explanation: None