Which amongst the following antibiotics is an example of narrow spectrum antibiotic?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → Penicillin G
Penicillin G acts mainly on Gram-positive bacteria, so it is a narrow spectrum antibiotic.
Note: This question is from the pre-rationalised NCERT book (2022-23). The topic is not there in the latest NCERT book (2026-27), and it is also out of the CUET 2026 syllabus.
NCERT (Pre-rationalised edition, 2022-23):
Antibiotics – …
