Antibiotics target bacterial infections only

Steps:

• Recall that antibiotics kill or inhibit bacteria by disrupting their cell walls or protein synthesis.
• Identify the disease type: bacterial infections involve bacteria as the pathogen.
• Eliminate non-bacterial options like heart disease, parasitic malaria, and viral illnesses.
• Confirm antibiotics are ineffective against non-bacterial causes.

Why A is correct:

• Antibiotics are defined as drugs that specifically combat bacterial infections by targeting bacterial mechanisms, as per microbiology principles.

Why the others are wrong:

• B: Coronary heart disease is cardiovascular, treated with lifestyle changes or statins, not antibiotics.
• C: Malaria is caused by parasites, requiring antimalarials like chloroquine.
• D: Viral infections, such as flu, are fought by the immune system or antivirals, not antibiotics.

Final answer: A