Asking a patient, "Does it hurt more when you breathe deeply?" represents what part of the OPQRST question format?

Lead azide is a primary explosive that is

a. a commercial explosive whose proper chemical name is N-methyl-N-2,4,6-tetra-nitroaniline. b. the active component of the commercial explosive substance whose proper chemical name is pentaerythritol tetranitrate. c. the primary explosive mercury(II) cyanate, a substance whose chemical formula is Hg(CNO)2. d. a unique commercial explosive in that it is the only one whose chemical composition does not include oxygen.

If a provider collects money from a patient for Medicare coinsurance and Medicare determines the services ____________________________, the provider will have to refund the patient the payment made

a. medically unnecessary b. necessary c. medically necessary d. not covered