Which statement best describes the primary function of antibiotics?

• A. Alter host immune responses
• B. Inhibit bacterial growth or reproduction
• C. Kill human cells
• D. Stimulate bacterial growth

Answer: (B)

Antibiotics work by stopping bacteria from growing or multiplying, giving the body's defenses a better chance to clear the infection. They target bacterial processes in a way human cells aren’t affected as much, which is why they can suppress or kill bacteria without harming the host. Some antibiotics are bactericidal, meaning they actively kill bacteria, often by damaging the cell wall or essential enzymes. Others are bacteriostatic, meaning they halt bacterial growth so the immune system can finish the job. This is why the primary function isn’t to alter immune responses, kill human cells, or make bacteria grow; the main purpose is to control the bacterial population to treat the infection.