**Brain Natriuretic Peptide Degradation**

**Core Concept**
Brain natriuretic peptide (BNP) is a hormone secreted by the ventricles of the heart in response to excessive stretching of cardiomyocytes. It plays a crucial role in vasodilation, natriuresis, and diuresis to reduce blood pressure and volume overload. The degradation of BNP is essential for regulating its physiological effects.

**Why the Correct Answer is Right**
BNP is primarily degraded by neutral endopeptidase (NEP), also known as neprilysin, a metalloprotease enzyme. NEP breaks down BNP into its inactive fragments, thereby terminating its biological activity. This degradation process is an essential feedback mechanism to regulate the levels of BNP in the circulation and prevent excessive vasodilation and natriuresis.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify the correct enzyme involved in BNP degradation. While other enzymes may have some role in BNP metabolism, NEP is the primary enzyme responsible for its degradation.
**Option B:** This option is incorrect because it is not a well-established enzyme involved in BNP degradation. Although other proteases may have some activity against BNP, NEP is the primary enzyme responsible for its breakdown.
**Option C:** This option is incorrect because it is not a specific enzyme involved in BNP degradation. While other enzymes may have some role in BNP metabolism, NEP is the primary enzyme responsible for its degradation.

**Clinical Pearl / High-Yield Fact**
Inhibitors of neutral endopeptidase, such as omapatrilat, have been developed as potential therapeutic agents for heart failure. These inhibitors can increase BNP levels and enhance its vasodilatory and natriuretic effects, providing a potential benefit in patients with heart failure.

**Correct Answer: C. Neprilysin.