Thyroxin is secreted by which gland ?

Options

A. Adrenel
B. Parathyroid
C. Pituitary
D. Thyroid gland

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks which gland secretes the hormone thyroxine. Thyroxine is an important hormone that plays a crucial role in regulating metabolism and energy levels in the body.

2. **Analyzing the Options**: The options provided are:
- A. Adrenal
- B. Parathyroid
- C. Pituitary
- D. Thyroid Gland

3. **Evaluating Each Option**:
- **Option A: Adrenal Gland**: This gland primarily secretes hormones such as adrenaline and noradrenaline, which are involved in the body's stress response. It does not secrete thyroxine.
- **Option B: Parathyroid Gland**: The parathyroid glands are responsible for secreting parathyroid hormone (PTH), which regulates calcium levels in the blood. They do not produce thyroxine.
- **Option C: Pituitary Gland**: Known as the master gland, the pituitary gland secretes various hormones that regulate other glands but does not secrete thyroxine.
- **Option D: Thyroid Gland**: The thyroid gland is specifically responsible for producing thyroxine (T4), which is crucial for metabolism.

4. **Conclusion**: After evaluating all the options, it is clear that the gland that secretes thyroxine is the **Thyroid Gland**.

5. **Final Answer**: The correct answer is **D. Thyroid Gland**.

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