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Which of the following is not a broad-spectrum antibiotic ? (1) Vancomycin (2) Ampicillin (3) Ofloxacin (4) Penicillin G

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

Correct answer: Penicillin G

Solution

Penicillin G is primarily effective against gram-positive bacteria and has limited activity against gram-negative bacteria, making it a narrow-spectrum antibiotic compared to the others listed, which target a wider range of pathogens.

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