**Core Concept**
Bacteremia refers to the presence of viable bacteria in the bloodstream. This condition can lead to various complications, including sepsis, endocarditis, and meningitis. The primary concern with bacteremia is the potential for bacterial dissemination and subsequent organ dysfunction.

**Why the Correct Answer is Right**
Bacteremia is typically characterized by the presence of bacteria in the peripheral blood. This can be due to a variety of factors, including bacterial translocation from the gut, direct inoculation through a wound, or hematogenous spread from a distant site of infection. The host's immune response to bacteremia involves the activation of neutrophils, macrophages, and the complement system, which work together to eliminate the bacterial pathogens.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as bacteremia is a specific term that refers to the presence of viable bacteria in the blood, whereas sepsis is a broader condition characterized by a systemic inflammatory response to infection.
**Option B:** This option is incorrect as bacteremia is not a characteristic feature of endocarditis, although endocarditis can indeed lead to bacteremia.
**Option C:** This option is incorrect as bacteremia is not a characteristic feature of meningitis, although meningitis can be caused by bacterial pathogens that may also cause bacteremia.

**Clinical Pearl / High-Yield Fact**
It is essential to note that bacteremia can be a precursor to sepsis, and prompt recognition and treatment of bacteremia are crucial in preventing the progression to sepsis and its associated morbidity and mortality.

**Correct Answer: B. Sepsis