Iodine is present in the secretion of

Options

A. Adrenal
B. Thyroid/thyroxine
C. Pancreas
D. Pituitary.

Answer

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks where iodine is present in the secretion of various glands or hormones.

2. **List the Options**: The options provided are:
- Adrenal
- Thyroid
- Thyroxin
- Pancreas
- Pituitary

3. **Understand the Role of Iodine**: Iodine is an essential element required for the synthesis of thyroid hormones, particularly thyroxin (T4).

4. **Analyze Each Option**:
- **Adrenal**: The adrenal gland does not secrete iodine-containing hormones. It primarily produces hormones like epinephrine and norepinephrine.
- **Thyroid**: The thyroid gland synthesizes thyroxin, which contains iodine.
- **Thyroxin**: This is a hormone produced by the thyroid gland and contains iodine.
- **Pancreas**: The pancreas secretes hormones such as insulin and glucagon, which do not contain iodine.
- **Pituitary**: The pituitary gland secretes hormones like follicle-stimulating hormone and growth hormone, which do not contain iodine.

5. **Conclusion**: The correct answer is that iodine is present in the secretion of the thyroid gland, specifically in the hormone thyroxin.

6. **Final Answer**: Thyroid and thyroxin.

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