When a person's immune system produces antibodies after exposure to a pathogen, this is known as?

• A. Passive immunity
• B. Active immunity
• C. Natural immunity
• D. Artificial immunity

Answer: (B)

When a person's immune system produces antibodies after exposure to a pathogen, this scenario is characterized as active immunity. This type of immunity occurs when an individual's immune system actively responds to an infection by recognizing the pathogen and generating specific antibodies against it.

The process can occur naturally through an infection, or it can be induced through vaccination. In both cases, the body develops a memory response, allowing for a quicker and more effective reaction upon future exposures to the same pathogen. This is crucial for long-term protection because it involves the body's own immune response rather than relying on external sources of antibodies.

Understanding active immunity is vital since it highlights how the immune system adapts and learns to protect the body against diseases over time.