All of the following could be reasons why antimicrobic treatment fails except
A. a disk diffusion test showing pathogen sensitivity to the antimicrobic.
B. not completing the full course of treatment.
C. the inability of the drug to diffuse into the infected body compartment.
D. a mixed infection where some of the pathogens are drug resistant.
E. diminished gastrointestinal absorption due to an underlying condition or age.
Answer: A
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