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You have had a sore throat for over a week. You go to the doctor and she gives you a prescription for an antibiotic. She says for you to make sure that you finish the whole prescription.
Which of the following explains why?
The bacteria can become resistant to the antibiotic, and the next time it will not work.
The antibiotic gets stronger the more of it you take.
The antibiotic will only work after ten days.
The antibiotic only starts to work after you have taken the full prescription.