Question

1. which of the following statements is true about vaccines? a. vaccines contain live pathogens. b. vaccines can cause infections. c. vaccines provoke an immune response in the body. d. vaccines are also called antibiotics.

Explanation:

• Option A: Vaccines usually have weakened or inactivated pathogens, not live ones (except some attenuated vaccines, but not all), so A is false.
• Option B: Vaccines are designed to prevent infections, not cause them (rare adverse events are not typical infections), so B is false.
• Option C: Vaccines introduce antigens (from pathogens) to trigger the body's immune system to produce a response (like antibodies), so this is true.
• Option D: Vaccines and antibiotics are different; antibiotics treat bacterial infections, vaccines prevent infections, so D is false.

Answer:

C. Vaccines provoke an immune response in the body.