Which of the set of two hormones is having different sources?

Options

A. GnRH and somatostatin
B. Prolactin and thyroid stimulating hormone
C. Oxytocin and vasopressin
D. Calcitonin and parathormone

Answer

To determine which set of two hormones has different sources, we will analyze each option provided in the question.

1. **Gonadotrophin Releasing Hormone (GnRH) and Somatostatin**:
- Both of these hormones are produced in the **hypothalamus**. Therefore, they share the same source.
- **Conclusion**: Incorrect option.

2. **Prolactin and Thyroid Stimulating Hormone (TSH)**:
- Prolactin is produced by the **anterior pituitary gland**.
- Thyroid Stimulating Hormone (TSH) is also produced by the **anterior pituitary gland**.
- **Conclusion**: Incorrect option.

3. **Oxytocin and Vasopressin (also known as Antidiuretic Hormone, ADH)**:
- Both oxytocin and vasopressin are synthesized in the **hypothalamus** and released from the **posterior pituitary gland**.
- **Conclusion**: Incorrect option.

4. **Calcitonin and Parathormone (PTH)**:
- Calcitonin is produced by the **thyroid gland**.
- Parathormone (PTH) is produced by the **parathyroid glands**.
- Since these two hormones come from different sources, this is the correct option.

**Final Answer**: The correct set of hormones with different sources is **Calcitonin and Parathormone**.

---