Which among the following hormone initiate development of secondary sexual characters in female?

Options

A. GnRH
B. Estradiol
C. Estriol
D. Progesterone

Answer

To determine which hormone initiates the development of secondary sexual characteristics in females, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Hormones Involved**: The question asks about the hormone responsible for initiating secondary sexual characteristics in females. The primary hormone associated with this process is estrogen.

2. **Understand the Forms of Estrogen**: Estrogen exists in several forms, with the most significant being estradiol, estrone, and estriol. Among these, estradiol is the most potent and is primarily responsible for the development of secondary sexual characteristics.

3. **Role of Ovaries**: Estrogens, particularly estradiol, are produced mainly in the ovaries, which are the primary reproductive organs in females. This production is crucial for the development of secondary sexual traits such as breast development, widening of hips, and the regulation of menstrual cycles.

4. **Metabolism of Estrogens**: Estriol, another form of estrogen, is produced from the metabolism of estradiol and is primarily synthesized in the liver and placenta. However, it is not the main hormone responsible for initiating secondary sexual characteristics.

5. **Conclusion**: Based on the information gathered, estradiol (a form of estrogen) is the hormone that initiates the development of secondary sexual characteristics in females.

### Final Answer:
The hormone that initiates the development of secondary sexual characteristics in females is **estradiol** (a form of estrogen).

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