**Core Concept**
Anitschkow cells are a type of macrophage that play a crucial role in the pathogenesis of rheumatic heart disease. They are characterized by their foamy cytoplasm and are often found in the areas of inflammation and tissue damage.

**Why the Correct Answer is Right**
Anitschkow cells are typically seen in the context of rheumatic heart disease, where they accumulate in the cardiac valves, particularly the mitral valve. This occurs due to the autoimmune response to group A beta-hemolytic streptococcal infection, leading to inflammation and scarring of the valve tissue. The presence of Anitschkow cells is a hallmark of this condition, and their identification is often used as a diagnostic clue.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Anitschkow cells are not typically associated with other forms of heart disease, such as coronary artery disease or cardiomyopathy.
**Option B:** This option is incorrect because Anitschkow cells are not a feature of infectious diseases, such as endocarditis or myocarditis.
**Option C:** This option is incorrect because Anitschkow cells are not a normal finding in cardiac tissue; their presence indicates an underlying pathological process.

**Clinical Pearl / High-Yield Fact**
Anitschkow cells are a key diagnostic feature of rheumatic heart disease, and their presence should prompt a thorough investigation for underlying streptococcal infection and autoimmune disease.

**Correct Answer:** D.