A factor in the development of multidrug-resistant strains of Mycobacterium tuberculosis is that
A. many TB patients live in less-than ideal circumstances.
B. the daily multidrug regimen lasts up to 9 months.
C. multiple antibiotics must be taken in the daily regimen.
D. All of the above contribute to the development of resistant strains of Mycobacterium tuberculosis.
Answer: D
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