**Core Concept**
Rheumatic heart disease (RHD) is a complication of rheumatic fever, characterized by inflammation and scarring of the heart valves. It primarily affects the mitral and aortic valves, leading to stenosis or regurgitation. The disease process involves autoimmune responses to Group A beta-hemolytic streptococci (GABHS) infections.

**Why the Correct Answer is Right**
The correct answer is usually not seen in rheumatic heart disease due to the disease's predilection for the mitral and aortic valves. The mitral valve is most commonly affected, with the posterior leaflet being the most frequently involved. This is because the mitral valve is the last valve to be affected by the left ventricular outflow tract (LVOT) obstruction, which is a hallmark of RHD. The tricuspid valve is less commonly involved, and when it is, it is often a result of secondary pulmonary hypertension.

**Why Each Wrong Option is Incorrect**
* **Option A:** Mitral stenosis is a common manifestation of RHD, often presenting with symptoms of heart failure and arrhythmias.
* **Option B:** Aortic regurgitation can occur due to inflammation and scarring of the aortic valve, leading to aortic valve incompetence.
* **Option C:** Tricuspid regurgitation is usually not seen in RHD, making it the correct answer. This is because the tricuspid valve is less frequently involved, and when it is, it is often due to secondary pulmonary hypertension.

**Clinical Pearl / High-Yield Fact**
In RHD, the mitral valve is the most commonly affected valve, with the posterior leaflet being the most frequently involved. This is due to the disease's predilection for the mitral valve and its involvement in the left ventricular outflow tract (LVOT) obstruction.

**Correct Answer:** C. Tricuspid regurgitation is usually not seen in rheumatic heart disease.