Which of the following hormones is not proteinaceous is nature?

Options

A. TSH
B. Aldosterone
C. LH
D. FSH

Answer

To determine which hormone is not proteinaceous in nature, we will analyze each of the options provided.

### Step 1: Understand the nature of hormones
Hormones can be classified into different categories based on their chemical structure. The two main categories are:
- Proteinaceous hormones (peptides and proteins)
- Non-proteinaceous hormones (steroid hormones and others)

### Step 2: Analyze each option
1. **TSH (Thyroid Stimulating Hormone)**: TSH is a glycoprotein hormone produced by the anterior pituitary gland. It is proteinaceous in nature.

2. **Aldosterone**: Aldosterone is a steroid hormone produced by the adrenal cortex. It is not proteinaceous; instead, it is derived from cholesterol.

3. **Luteinizing Hormone (LH)**: LH is also a glycoprotein hormone produced by the anterior pituitary gland. It is proteinaceous in nature.

4. **FSH (Follicle Stimulating Hormone)**: FSH is another glycoprotein hormone produced by the anterior pituitary gland. It is proteinaceous in nature.

### Step 3: Conclusion
From the analysis above, the only hormone that is not proteinaceous in nature is **Aldosterone**. Therefore, the correct answer is **Option 2: Aldosterone**.

### Summary of the Solution
- TSH is proteinaceous.
- Aldosterone is not proteinaceous (it is a steroid hormone).
- LH is proteinaceous.
- FSH is proteinaceous.

Thus, the answer is **Aldosterone**.