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Passage: Doctors are increasingly concerned about the overuse of antibiotics for minor illnesses such as common colds, which are usually caused by viruses and do not respond to these drugs. Overuse allows bacteria to develop resistance, making future infections harder to treat. Health authorities now advise patients to consult a physician before taking antibiotics rather than self-medicating based on past prescriptions. Question: According to the passage, why don’t antibiotics work on common colds?
A. Antibiotics have expired ingredients
B. Colds are usually caused by viruses, not bacteria ✅
C. Doctors refuse to prescribe them
D. Colds are too mild to treat
