Which of the following is correctly matched?

Options

A. Thyroxine - Tetanus
B. Insulin - Diabetes insipidus
C. Adrenaline - HepatitiS
D. Parathyroid - Tetany

Answer

To determine which of the following pairs is correctly matched, we will analyze each option one by one.

### Step-by-Step Solution:

1. **Option 1: Thyroxine and Tetanus**
- **Thyroxine**: This hormone is produced by the thyroid gland and is responsible for regulating the basal metabolic rate.
- **Tetanus**: This is an infection caused by the bacterium *Clostridium tetani*, which affects the nervous system and causes muscle stiffness and spasms.
- **Conclusion**: This option is incorrect because thyroxine does not relate to tetanus.

2. **Option 2: Insulin and Diabetes Insipidus**
- **Insulin**: This hormone is produced by the pancreas and regulates blood sugar levels.
- **Diabetes Insipidus**: This condition is characterized by excessive thirst and urination due to a deficiency of the antidiuretic hormone (ADH), not insulin.
- **Conclusion**: This option is incorrect because insulin is related to diabetes mellitus, not diabetes insipidus.

3. **Option 3: Adrenaline and Hepatitis**
- **Adrenaline**: Also known as epinephrine, it is produced by the adrenal glands and is involved in the fight-or-flight response.
- **Hepatitis**: This refers to inflammation of the liver, which is unrelated to adrenaline.
- **Conclusion**: This option is incorrect because adrenaline does not cause or relate to hepatitis.

4. **Option 4: Parathyroid and Tetanus**
- **Parathyroid**: The parathyroid glands produce parathyroid hormone (PTH), which regulates calcium levels in the blood.
- **Tetanus**: As mentioned, this condition is associated with low calcium levels in the blood, which can lead to muscle spasms (tetany).
- **Conclusion**: This option is correct because parathyroid hormone is indeed related to conditions involving calcium levels, including tetany.

### Final Answer:
The correctly matched pair is **Option 4: Parathyroid and Tetanus**.