Answer:
I think it's
A) use the MSDS sheet to add a label to the one without, and read and file both MSDS sheets for other employees to access
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B You do not take it off and return it, this will add heavy confusion among the pharmacist which will lead to proper disposal
C bringing mislabel stuff is correct stuff is right, but then do what, there's dozens of meds that could look the same, he'll have to dispose of the meds so it was incorrect at the end
D MIXING MEDS ISN'T OKAY so this deems it as incorrect regardless of the situation