Which of the following steriod sex hormone influenced secondary sex organs ?

Options

A. Progesterone
B. Oestrogen
C. LH
D. LTH

Answer

To determine which steroid sex hormone influences secondary sex organs, we can follow these steps:

### Step 1: Identify the Steroid Sex Hormones
The two main steroid sex hormones produced in females are progesterone and estrogen.

### Step 2: Understand the Functions of Each Hormone
- **Progesterone**: This hormone is primarily involved in supporting pregnancy and preparing the mammary glands for milk production. It influences the development of the alveoli in the mammary glands.
- **Estrogen**: This hormone plays a crucial role in the development and regulation of female secondary sexual characteristics. It influences features such as breast development, high-pitched voice, and overall female sexual behavior.

### Step 3: Analyze the Options
The options provided are:
1. Progesterone
2. Estrogen
3. LH hormone (Luteinizing Hormone)
4. LTH hormone (Luteotropic Hormone or Prolactin)

From the analysis:
- **Progesterone** supports pregnancy and acts on mammary glands but does not primarily influence secondary sex characteristics.
- **Estrogen** is directly responsible for the development and regulation of secondary sex organs and characteristics.
- **LH hormone** is a peptide hormone and does not belong to the steroid category.
- **LTH hormone** (Prolactin) is also not a steroid hormone and is primarily involved in milk production.

### Step 4: Conclusion
The hormone that influences secondary sex organs is **Estrogen**.

### Final Answer
The correct option is **Estrogen**.

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