You overhear a nurse giving discharge instructions to a patient who had knee surgery. The nurse says, 'Take one tablet of the pain medication every six hours as needed for pain. The antibiotic is different; you must take one tablet every eight hours, even if you feel fine, until the bottle is empty.' What is the most critical instruction regarding the antibiotic?
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A
It should be taken only when the patient feels pain.
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B
The full course must be completed, regardless of symptoms.
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C
It should be taken every six hours with the pain medication.
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D
The patient can stop taking it once the knee feels better.