**Core Concept**
Rheumatic heart disease is a complication of rheumatic fever, which can lead to the destruction of heart valves, particularly the mitral and aortic valves. This occurs due to an autoimmune response to group A beta-hemolytic streptococcal infection.

**Why the Correct Answer is Right**
The destruction of heart valves in rheumatic heart disease is primarily caused by inflammation and scarring of the valve tissue. This process is mediated by the immune system's response to the streptococcal infection, which triggers the production of antibodies that cross-react with valve tissue. The resulting inflammation and fibrosis can lead to valve deformity and dysfunction. The most commonly affected valves are the mitral valve (resulting in mitral stenosis or mitral regurgitation) and the aortic valve (resulting in aortic stenosis or aortic regurgitation).

**Why Each Wrong Option is Incorrect**
* **Option A:** Endocarditis is an infection of the heart valves, but it is not typically associated with the destruction of valves as seen in rheumatic heart disease.
* **Option B:** Cardiac amyloidosis is a condition characterized by the deposition of amyloid proteins in the heart, which can lead to restrictive cardiomyopathy, but it is not directly associated with valve destruction.
* **Option D:** Hypertrophic cardiomyopathy is a genetic disorder that affects the heart muscle, leading to thickening of the left ventricular wall, but it is not typically associated with valve destruction.

**Clinical Pearl / High-Yield Fact**
Rheumatic heart disease is a major cause of valve disease worldwide, particularly in developing countries where access to antibiotics and modern medicine may be limited. Early diagnosis and treatment of streptococcal infections can help prevent the development of rheumatic heart disease.

**Correct Answer: C. Rheumatic heart disease**