Match the gland, hormone and function.

Options

A. `{:("Source gland","Hormone","Function"),("Posterior pituitary","Vasopressin","Stimulates resorption of water in the distal tubules in the nephron"):}`
B. `{:("Source gland","Hormone","Function"),("Corpus luteum","Oestrogen","Supports pregnancy"):}`
C. `{:("Source gland","Hormone","Function"),("Thyroid","Thyroxine","Regulates blood calcium level"):}`
D. `{:("Source gland","Hormone","Function"),("Anterior pituitary","Oxytocin","Contraction of uterus muscles during child birth"):}`

Explanation

To solve the question of matching the gland, hormone, and function, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Identify the Gland and Hormone:**
- The first gland mentioned is the **posterior pituitary**. The hormone secreted by this gland is **vasopressin**, also known as **antidiuretic hormone (ADH)**.

2. **Determine the Function of Vasopressin:**
- The function of vasopressin is to **stimulate the resorption of water in the distal parts of the nephron (kidney tubules)**. This means it helps the body retain water and reduces urine output, which is indeed the correct function associated with ADH.

3. **Evaluate the Second Option:**
- The second gland mentioned is the **corpus luteum**, which is a temporary endocrine gland. It is said to secrete **estrogen**, but this is incorrect. The corpus luteum primarily secretes **progesterone**, which is crucial for maintaining the endometrium during pregnancy.

4. **Evaluate the Third Option:**
- The third gland is the **thyroid gland**, which is said to secrete **thyroxin**. However, the function given is to regulate blood calcium levels, which is incorrect. Thyroxin regulates the **basal metabolic rate (BMR)**, while calcium levels are regulated by **thyrocalcitonin** (from the thyroid) and **parathyroid hormone** (from the parathyroid glands).

5. **Evaluate the Fourth Option:**
- The fourth gland is the **anterior pituitary**, which is said to secrete **oxytocin**. This is incorrect because oxytocin is secreted by the **posterior pituitary**. The anterior pituitary secretes hormones like **FSH, LH, ACTH, growth hormone, and prolactin**.

6. **Conclusion:**
- Based on the analysis, the only correct match is the first option: **Posterior Pituitary - Vasopressin - Stimulates resorption of water**.

### Final Answer:
- The correct match is:
- **Posterior Pituitary - Vasopressin - Stimulates resorption of water.**