**Core Concept**
Innate immunity is the body's first line of defense against infections, providing immediate, non-specific protection against a wide range of pathogens. It is an essential component of the immune system, functioning to prevent the entry of pathogens into the body and to eliminate them if they do manage to breach the host's defenses.

**Why the Correct Answer is Right**
The correct answer, **Option C: Not affected by genetic affected**, is incorrect because innate immunity is indeed influenced by genetic factors. For instance, certain genetic variations can affect the function of pattern recognition receptors (PRRs), such as Toll-like receptors (TLRs), which play a crucial role in recognizing pathogens and activating the innate immune response. Additionally, genetic factors can influence the production and function of antimicrobial peptides and proteins, which are essential components of innate immunity.

**Why Each Wrong Option is Incorrect**
* **Option A:** This statement is true about innate immunity, as it is non-specific and can respond to a wide range of pathogens.
* **Option B:** This statement is also true, as innate immunity is indeed the first line of defense against infections.
* **Option C:** As explained above, innate immunity is indeed affected by genetic factors, making this statement incorrect.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that innate immunity is not just a passive barrier against pathogens; it also plays an active role in recognizing and eliminating infections through the activation of various immune cells and the production of pro-inflammatory cytokines.

**✓ Correct Answer: C. Not affected by genetic affected**