In the following options ,each one has a pair of names. They are the same hormone with different names. Which one of these does not follow the rule ?

Options

A. Parathormone - Collip's hormone
B. Tetra- iodothyrosine - thyroxine
C. Prolactin - Lactating hormone
D. Vasopressin - Anti diuretic hormone

Answer

To solve the question, we need to identify which pair of names refers to the same hormone and which does not. Let's analyze each option step by step.

### Step-by-Step Solution:

1. **Option 1: Parathormone and Colips Hormone**
- Parathormone is a hormone secreted by the parathyroid glands.
- Colips hormone is another name for parathormone, named after a scientist.
- **Conclusion**: This pair refers to the same hormone.

2. **Option 2: Tetraiodothyroxine and Thyroxine**
- Tetraiodothyroxine is a hormone produced by the thyroid gland, commonly known as T4.
- Thyroxine is the common name for tetraiodothyroxine.
- **Conclusion**: This pair refers to the same hormone.

3. **Option 3: Prolactin and Lactating Hormone**
- Prolactin is a hormone that stimulates lactation.
- Lactating hormone refers to the function of prolactin but is not an alternate name for it.
- **Conclusion**: This pair does not refer to the same hormone.

4. **Option 4: Vasopressin and Antidiuretic Hormone**
- Vasopressin is a hormone produced in the hypothalamus and released by the posterior pituitary gland.
- Antidiuretic hormone (ADH) is another name for vasopressin.
- **Conclusion**: This pair refers to the same hormone.

### Final Answer:
The pair that does not follow the rule of being the same hormone with different names is **Prolactin and Lactating Hormone**.

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