Which of the following is a primary characteristic of innate immunity?

• A. It relies on antibody production to neutralize pathogens.
• B. It generates memory cells for long-term protection.
• C. It is only activated after exposure to a specific antigen.
• D. It provides a rapid, non-specific response to pathogens.

Answer: (D)

Verified step by step guidance

1. Understand that innate immunity is the body's first line of defense against pathogens and acts immediately or within hours of an antigen's appearance in the body.
2. Recognize that innate immunity is non-specific, meaning it does not target specific pathogens but rather responds to a broad range of invaders.
3. Note that innate immunity does not rely on antibody production; this is a feature of adaptive immunity.
4. Recall that innate immunity does not generate memory cells; memory cell formation is a hallmark of adaptive immunity.
5. Conclude that the primary characteristic of innate immunity is its rapid, non-specific response to pathogens, providing immediate defense without prior exposure.