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Which of the following is NOT a broad-spectrum antibiotic?

1. Vancomycin
2. Ampicillin
3. Ofloxacin
4. Penicillin G

Correct answer: Penicillin G

Solution

Penicillin G is a narrow-spectrum antibiotic, while ampicillin and ofloxacin (and as listed, vancomycin) are taken as broad-spectrum in standard NCERT treatment.

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