The hormones controlling secondary sexual characters include

Options

A. Thyroxine
B. FSH and LH
C. GH and FSH
D. Testosterone and estrogen

Answer

To answer the question regarding which hormones control secondary sexual characters, we will analyze each option provided:

### Step-by-Step Solution:

1. **Understanding Secondary Sexual Characters**:
- Secondary sexual characters refer to the physical traits that differentiate the sexes but are not directly involved in reproduction. In males, these include features like facial hair, deep voice, and increased muscle mass. In females, they include breast development and wider hips.

2. **Analyzing Option A: Thyroxine**:
- Thyroxine is a hormone produced by the thyroid gland. Its primary role is to regulate metabolism and control calcium levels in the blood. It does not play a direct role in the development of secondary sexual characteristics.
- **Conclusion**: Not a correct option.

3. **Analyzing Option B: FSH and LH**:
- Follicle Stimulating Hormone (FSH) and Luteinizing Hormone (LH) are gonadotropins produced by the pituitary gland. They stimulate the gonads (ovaries and testes) to produce sex hormones. While they are involved in the reproductive system, they do not directly control secondary sexual characteristics.
- **Conclusion**: Not a correct option.

4. **Analyzing Option C: GH and FSH**:
- Growth Hormone (GH) is responsible for growth and development, while FSH, as mentioned, is a gonadotropin. Similar to option B, they do not directly influence secondary sexual characteristics.
- **Conclusion**: Not a correct option.

5. **Analyzing Option D: Testosterone and Estrogen**:
- Testosterone (primarily in males) and Estrogen (primarily in females) are the key hormones responsible for the development of secondary sexual characteristics. Testosterone promotes male traits such as increased muscle mass and body hair, while Estrogen promotes female traits such as breast development and fat distribution.
- **Conclusion**: This is the correct option.

### Final Answer:
The hormones controlling secondary sexual characters include **Testosterone and Estrogen (Option D)**.

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