**Core Concept**
Leptin is a hormone predominantly produced by adipose tissue that plays a key role in regulating energy balance, body weight, and metabolism. It acts on the hypothalamus to suppress appetite and increase energy expenditure.

**Why the Correct Answer is Right**
Leptin acts through its receptor, LEPR, to activate the JAK/STAT signaling pathway, ultimately leading to the suppression of neuropeptide Y (NPY) and the stimulation of pro-opiomelanocortin (POMC) expression in the hypothalamus. This results in decreased food intake and increased energy expenditure, contributing to weight loss and improved glucose homeostasis.

**Why Each Wrong Option is Incorrect**
**Option A:** This statement is true, as leptin levels are indeed negatively correlated with body fat mass, making it a useful biomarker for obesity assessment.
**Option B:** This statement is false; leptin primarily acts on the hypothalamus to regulate energy balance, not the pancreas to regulate glucose homeostasis.
**Option C:** This statement is true, as leptin has been shown to have anti-inflammatory properties, particularly in the context of obesity-related inflammation.

**Clinical Pearl / High-Yield Fact**
Leptin deficiency or resistance is associated with obesity, insulin resistance, and metabolic syndrome, highlighting the importance of this hormone in maintaining energy homeostasis.

**Correct Answer:** B.