Bacteria are killed by antibiotics. The antibiotic are the medicines that are resistance to bacteria.
The correct option is A.
What is antibiotic?
An antibiotic is an antimicrobial substance that works on bacteria.
Some examples of bacteria are penicillins, macrolides, Cephalosporins, etc.
They either stop the growth of bacteria inside the body or kill them.
They are used to preventing or stop bacterial infections.
Thus, the correct option is A, Bacterium.
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