Antiageing hormone is

Options

A. Thyroxine
B. Melatonin
C. Estrogen
D. Testosterone.

Answer

To determine which hormone is considered an anti-aging hormone, we will analyze the options provided: thyroxine, melatonin, estrogen, and testosterone.

### Step-by-Step Solution:

1. **Understand Thyroxine**:
- Thyroxine is a hormone secreted by the thyroid gland.
- It plays a role in regulating metabolism, including the consumption of oxygen and the oxidation of glucose.
- **Conclusion**: Thyroxine is not primarily associated with anti-aging.

2. **Understand Melatonin**:
- Melatonin is derived from the amino acid tryptophan and is secreted by the pineal gland.
- It regulates the body’s circadian rhythms, including sleep-wake cycles, and has effects on metabolism and pigmentation.
- Recent studies have indicated that melatonin may have anti-aging properties.
- **Conclusion**: Melatonin is a strong candidate for the anti-aging hormone.

3. **Understand Estrogen**:
- Estrogen is the primary female sex hormone secreted by ovarian follicles.
- It is responsible for the development of female secondary sexual characteristics and reproductive functions.
- **Conclusion**: While estrogen has various roles, it is not specifically recognized as an anti-aging hormone.

4. **Understand Testosterone**:
- Testosterone is the primary male sex hormone secreted by the testes.
- It stimulates the development of male secondary sexual characteristics.
- **Conclusion**: Testosterone is not classified as an anti-aging hormone.

5. **Final Decision**:
- After analyzing all the options, melatonin is recognized in recent studies as the anti-aging hormone.
- Therefore, the correct answer is **melatonin (Option B)**.

### Final Answer:
The anti-aging hormone is **melatonin**.