**Core Concept**
Bremelanotide, a synthetic peptide, is a melanocortin receptor agonist that modulates the melanocortin system, influencing various physiological processes including cardiovascular function, appetite regulation, and sexual arousal.

**Why the Correct Answer is Right**
Bremelanotide acts on MC4 receptors, which are involved in the regulation of appetite and energy homeostasis. Its mechanism of action also involves the release of nitric oxide, leading to vasodilation and increased blood flow. Bremelanotide has been investigated for its potential in treating female sexual arousal disorder (FSAD) and hypoactive sexual desire disorder (HSDD) in premenopausal women.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because bremelanotide is not primarily used for treating hypertension; its effects on blood pressure are not its main indication.
**Option B:** This option is incorrect because bremelanotide is not used as an anti-obesity medication; its mechanism of action does not primarily target appetite regulation.
**Option C:** This option is incorrect because bremelanotide is not used in the treatment of erectile dysfunction (ED); its indication is specific to female sexual arousal disorder (FSAD).

**Clinical Pearl / High-Yield Fact**
Bremelanotide's mechanism of action involves the release of nitric oxide, which is also a key player in the regulation of blood pressure and erectile function in men.

**Correct Answer: D. Treatment of female sexual arousal disorder (FSAD).**