Melation is secreted by:

Options

A. Pineal body
B. Skin
C. Pituitary Gland
D. Thyroid

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the secretion of melatonin, which is a hormone. We need to identify which gland is responsible for its secretion.

2. **Identifying the Options**: The options provided are:
- A) Pineal body
- B) Skin
- C) Pituitary gland
- D) Thyroid

3. **Analyzing Each Option**:
- **Pineal body**: The pineal gland is known to secrete melatonin, especially in response to darkness. It is often referred to as the "hormone of darkness."
- **Skin**: The skin does not secrete melatonin; it produces other substances, primarily related to protection and sensation.
- **Pituitary gland**: While the pituitary gland secretes many hormones (like TSH, ADH, etc.), it does not secrete melatonin.
- **Thyroid**: The thyroid gland produces thyroid hormones (T3 and T4) but does not produce melatonin.

4. **Conclusion**: Based on the analysis, the correct answer is option A) Pineal body, as it is the gland responsible for the secretion of melatonin.

**Final Answer**: Melatonin is secreted by the pineal body (option A).

---