**Question:** Which among the following is false regarding rheumatic heart disease?

A. Rheumatic heart disease is caused by an autoimmune response to streptococcal infection.
B. Mitral stenosis is the only valve involvement in rheumatic heart disease.
C. Rheumatic fever occurs in developed countries.
D. Treatment of rheumatic fever focuses on managing symptoms and supporting the patient.

**Correct Answer: C. Rheumatic fever occurs in developed countries.**

**Core Concept:** Rheumatic heart disease is a consequence of an inappropriate immune response to a streptococcal infection, particularly group A beta-hemolytic streptococci. This immune response leads to inflammation and damage to heart valves, causing valvular lesions and eventually heart failure.

**Why the Correct Answer is Right:** Rheumatic fever is a post-infectious condition, predominantly affecting children in developing countries where hygiene and sanitation are inadequate. It is a rare occurrence in developed countries where access to healthcare, antibiotics, and hygiene are better.

**Why Each Wrong Option is Incorrect:**

**A. False:** Rheumatic heart disease is the result of an autoimmune response triggered by the immune system against heart valve structures due to the persistence of streptococcal antigens post-infection. This misdirected immune response leads to inflammation, fibrosis, and valvular damage.

**B. False:** Mitral stenosis is a common valve involvement in rheumatic heart disease, not the only one. Rheumatic heart disease can affect any heart valve, including the mitral, tricuspid, aortic, and pulmonary valves, leading to various combinations of valve lesions.

**D. False:** Treatment for rheumatic fever focuses on managing symptoms and preventing complications, but it also includes antibiotic prophylaxis to prevent further infections and long-term management of valve lesions.

**Clinical Pearl:** Rheumatic fever is a preventable and treatable disease, emphasizing the importance of early diagnosis, appropriate antibiotic treatment, and public health measures to control streptococcal infections in high-risk populations.