Active immunity is a form of acquired immunity in which the body produces its own antibodies against disease-causing antigens. Which option best describes this concept?

Active immunity is a form of acquired immunity in which the body produces its own antibodies against disease-causing antigens. Which option best describes this concept?

• A. The body produces its own antibodies against disease-causing antigens
• B. It receives antibodies from another person
• C. It has no immune response
• D. It is not related to antigens

Answer: (A)

Active immunity occurs when the body’s immune system encounters an antigen and makes its own antibodies and memory cells in response. This is why protection tends to be long-lasting—the memory cells enable a faster, stronger response if the same antigen shows up again. The statement that the body produces its own antibodies against disease-causing antigens captures this idea precisely. In contrast, receiving antibodies from another person describes passive immunity, which provides immediate but temporary protection and doesn’t involve the body producing its own antibodies. The notion of no immune response contradicts how immunity works, and saying it isn’t related to antigens ignores the very triggers that prompt antibody production.

Active immunity occurs when the body’s immune system encounters an antigen and makes its own antibodies and memory cells in response. This is why protection tends to be long-lasting—the memory cells enable a faster, stronger response if the same antigen shows up again. The statement that the body produces its own antibodies against disease-causing antigens captures this idea precisely. In contrast, receiving antibodies from another person describes passive immunity, which provides immediate but temporary protection and doesn’t involve the body producing its own antibodies. The notion of no immune response contradicts how immunity works, and saying it isn’t related to antigens ignores the very triggers that prompt antibody production.