The changes that occur in the body of adolescents are under the control of hormones. Which hormone controls the development of secondary sexual characteristics in males during puberty?

Options

A. Testosterone
B. Thyroxin
C. Estrogen
D. Insulin

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks which hormone is responsible for the development of secondary sexual characteristics in males during puberty.

2. **Identifying Key Terms**: The key terms here are "secondary sexual characteristics," "males," and "puberty." Secondary sexual characteristics include features like increased muscle mass, deepening of the voice, and growth of facial hair.

3. **Considering the Options**: The question provides multiple hormone options. We need to analyze each option to determine which one is correct.

4. **Analyzing Each Hormone**:
- **Testosterone**: This hormone is produced in the testes and is primarily responsible for the development of male secondary sexual characteristics during puberty. Thus, it is a strong candidate.
- **Thyroxine**: This hormone regulates metabolism but does not play a role in the development of secondary sexual characteristics in males. Therefore, it is not the correct answer.
- **Estrogen**: This hormone is primarily involved in female sexual characteristics and the menstrual cycle, making it irrelevant to the question about males.
- **Insulin**: This hormone regulates glucose levels in the blood and is not related to sexual characteristics.

5. **Conclusion**: Based on the analysis, the hormone that controls the development of secondary sexual characteristics in males during puberty is **Testosterone**.

**Final Answer**: Testosterone

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