Read the passage: "Antibiotic resistance grows when antibiotics are prescribed for viral infections, which they cannot cure. Each unnecessary course kills sensitive bacteria and leaves resistant ones to multiply." The main idea is that
- A. antibiotics are dangerous drugs
- B. unnecessary prescribing selects for resistant bacteria
- C. viral infections are more serious than bacterial ones
- D. antibiotics should never be prescribed
Explanation
The passage explains a mechanism: pointless courses remove the sensitive bacteria and leave the resistant ones with no competition. It does not claim antibiotics are dangerous in themselves or that they should never be used, both of which overstate the argument. Main idea questions reward the option that covers the whole passage without exaggerating it.
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