Which term describes medicines that kill microorganisms, especially bacteria?

• A. Sun
• B. Microorganism
• C. Bacteria
• D. Antibiotics

Answer: (D)

Medicines that kill microorganisms, especially bacteria, are antibiotics. These drugs work by either killing bacteria or stopping them from growing, which helps the immune system clear the infection. They’re used specifically to treat bacterial infections, and they’re distinct from substances used on surfaces or skin (like disinfectants) and from the organisms themselves. The other options don’t fit because the sun isn’t a medicine, a microorganism is a living organism, and bacteria are a type of microorganism, not a drug. Antibiotics are the medicines used against bacteria.