What is the body's first line of defense against bacteria?

A) Intact skin
B) White blood cells
C) Lymph glands
D) Inflammatory response

The body's intact skin serves as the first line of defense against bacteria. The skin acts as a physical barrier preventing bacteria from entering the body.

Note: White blood cells and lymph glands are part of the immune system's response to bacterial infection, and the inflammatory response is a non-specific reaction to tissue damage or infection.