What term describes resistance to disease?

• A. Immunity
• B. Infectivity
• C. Imbalance
• D. Inoculation

Answer: (A)

Immunity is the body's ability to resist disease. It means your immune system can fend off infections, either through natural defenses like barriers and immune cells or through memory from previous infections or vaccination. This protective state reduces your chances of getting sick when exposed to a pathogen and can lessen illness if exposure occurs. The other terms don’t describe resistance itself: infectivity is how easily a pathogen can cause infection; inoculation is the act of introducing a vaccine or pathogen to provoke a response (and can lead to immunity, but isn’t the resistance itself); and imbalance isn’t the relevant term for resistance to disease.