An antibiotic is given repeatedly to treat a recurrent ear infection. It worked initially but now is no longer effective. This indicates that the Streptococcus bacterium:
A) is very sensitive to the antibiotic.
B) is being treated with an antibiotic that has experienced a manufacturing error, making it infective.
C) experienced natural selection that has allowed the resistant Streptococcus to survive and multiply.
D) are infectious only if they are sensitive to the antibiotic.
Correct Answer:
Verified
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