21. More promising chemotherapeutic agents for treating viral diseases is

A. leukocytic interferon
B. fibroblast interferon
C. interferon
D. nystatin

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22. A parenteral route of drug administration refers to

A. oral
B. nonoral
C. intravenously
D. intramuscularly

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23. Which of the following antibiotics can’t be used for the treatment of infections with β-lactamase-producing Staphylococcus aureus?

A. Vancomycin
B. Ampicillin/sulbactam
C. Cephalothin
D. Piperacillin

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24. Which of the following is not an aminoglycoside antibiotic?

A. Streptomycin
B. Neomycin
C. Kanamycin
D. Cephalosporin

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25. The nitrofurans differ from the antibiotics in that they

A. does not occur naturally
B. occur naturally
C. are antimicrobial drugs
D. all of these

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