The answer is morphine. The worst thing you can do on the NCLEX is think about what you did in clinical or take advice from a nurse who has been practicing for years and years. If you take a Kaplan course before NCLEX your Kaplan instructor will tell you that NCLEX questions exist in a perfect-world vaccum. A specific example our instructor gave us was an order for a narcotic. She explained that on NCLEX, if there is an option that says "give morphine," by picking that you ALREADY KNOW you 1) have an order 2) have the morphine drawn up 3) have identified all risks/contraindications and 4) you have all your rights of med. admin. covered.So given the nature of NCLEX, you can see this question has nothing to do with logic, clinical practice or common sense. "Talking to ER nurses will get you a seat to NCLEX Part II" - that's a quote from my NCLEX instructor. So in this MI question, you have a needle with morphine in one hand and an oxygen mask in the other - which do you give?Well, do they have a saturation problem? Possibly, but not likely yet. A coronary artery blockage is depriving one portion of the heart from oxygen. Giving more oxygen to this person is not the priority because its unlikely the area at risk is being perfused, so how effective will high SPO2's be?So if you can't get extra oxygen to the heart, the next best thing is to decrease the oxygen the heart needs. In Kaplan's instruction, pain is psychosocial, that is true...but in this example, the pain reduction is secondary to the decreased o2 consumption that results from taking morphine.I'm picking morphine all day