Immunity can be defined as

Immunity can be defined as

• A. a specific population at risk for a disease
• B. the condition of being resistant to disease
• C. the study of medicines used to treat diseases
• D. the study of the noncellular portion of the blood

Answer: (B)

Immunity is the body's ability to resist infection and disease, achieved through innate barriers and adaptive immune responses that recognize and eliminate pathogens. This makes immunity a statement about resistance to disease itself, not about who is at risk, what drugs treat diseases, or analyses of blood components. The other ideas describe epidemiology (who is at risk), pharmacology (drugs to treat disease), or serology/blood components, none of which define immunity. So the best description is the body's resistance to disease.

Immunity is the body's ability to resist infection and disease, achieved through innate barriers and adaptive immune responses that recognize and eliminate pathogens. This makes immunity a statement about resistance to disease itself, not about who is at risk, what drugs treat diseases, or analyses of blood components. The other ideas describe epidemiology (who is at risk), pharmacology (drugs to treat disease), or serology/blood components, none of which define immunity. So the best description is the body's resistance to disease.