The answer is A. interstitial fluid pressure
They usually have the supplies to administer a shot, a blood pressure machine, the little tool light the use for checking the eyes, ears, nose, mouth. They also have gowns and tongue depressors for checking for strep throat.
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That's so easy! It's HIV! HIV is pretty much like AIDS which is a virus. It's the stage before you get AIDS and you're guaranteed to die.
Hope this helps!