This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory, Subject name: Medicine
Patient presents with SP02 69%, BP 100/60 mm Hg, HR 120 beats per minute.What should be the first step in management of this patient? 
Select and explain. 
A. Secure airway and O2 supplementation, B. Start bolus IV fluid infusion, C. Injection bicarbonate, D. Injection Epinephrine iv
A: Secure airway and O2 supplementation
Answer: A: Secure airway and O2 supplementation 
Explanation: Ans. is 'a' i.e., Secure airway and O2 supplementation* Patient has hypoxemia probably due to hampered breathing, thus as per the rules of resuscitation (ABC) it is essential to secure airway first and begin O2 supplementation.