Immunity is defined as which?

• A. The ability of the body to destroy infectious agents
• B. The body's reaction to chemicals
• C. The body's resistance to fever
• D. The body's ability to grow hair

Answer: (A)

Immunity is the body's ability to defend itself against infectious agents by recognizing and destroying pathogens. This defense involves white blood cells, antibodies, and memory that helps the body respond more quickly to future exposures. This essential protective role is what the term immunity means, rather than simply reacting to chemicals, resisting fever (a symptom, not a defense mechanism), or growing hair (a physical trait).