Identify the hormone with its correct matching of source and function :

Options

A. Atrial natriuretic factor - ventricular wall increases the blood pressure
B. Oxytocin - posterior pituitary, growth and maintenance of mammary glands
C. Melatonin - pineal gland, regulates the normal rhythm of sleepwake cycle
D. Progesterone - corpus luteum, stimulation of growth and activities of female secondary sex organs

Explanation

To identify the hormone with its correct matching of source and function, we will analyze each option provided in the question step by step.

### Step 1: Analyze Anti-Natriuretic Factor (ANF)
- **Source**: Arterial wall
- **Function**: Decreases blood pressure
- **Evaluation**: The option states that ANF is found in the ventricular wall and increases blood pressure. This is incorrect because ANF is indeed found in the arterial wall and functions to decrease blood pressure.

**Hint**: Remember that ANF is involved in regulating blood pressure and is produced in the heart's atrial walls.

### Step 2: Analyze Oxytocin
- **Source**: Posterior pituitary gland
- **Function**: Facilitates childbirth and milk ejection
- **Evaluation**: The option states that oxytocin is found in the posterior pituitary and is responsible for the growth and maintenance of mammary glands. This is incorrect; while oxytocin is produced in the posterior pituitary, its primary functions are related to childbirth and lactation, not the growth of mammary glands (which is primarily influenced by estrogen).

**Hint**: Oxytocin is crucial for childbirth and lactation, not for the growth of mammary glands.

### Step 3: Analyze Melatonin
- **Source**: Pineal gland
- **Function**: Regulates sleep-wake cycles
- **Evaluation**: The option states that melatonin is secreted from the pineal gland and regulates the normal rhythm of the sleep-wake cycle. This is correct.

**Hint**: Melatonin is often referred to as the "sleep hormone" and is secreted by the pineal gland.

### Step 4: Analyze Progesterone
- **Source**: Corpus luteum
- **Function**: Supports pregnancy and regulates menstrual cycle
- **Evaluation**: The option states that progesterone stimulates the growth and activities of female secondary sex organs. This is misleading; while progesterone is produced by the corpus luteum, the primary hormone responsible for the development of secondary sexual characteristics is estrogen.

**Hint**: Progesterone is mainly involved in preparing the uterus for pregnancy, while estrogen is responsible for secondary sexual characteristics.

### Conclusion
Based on the analysis, the correct matching of hormone, source, and function is:
- **Melatonin**: Secreted from the **pineal gland** and regulates the **normal rhythm of the sleep-wake cycle**.

**Final Answer**: Melatonin from the pineal gland regulates the normal rhythm of the sleep-wake cycle.