A five week old embryo has Wolffian and Mullerian duct and after completing seven weeks one of two ducts is disappeared due to secretion of hormone 'A'. Identify the hormone 'A' and what will be the sex of embryo in future?

Options

A. Testosterone, male
B. AMH, male
C. Estrogen, female
D. Inhibin, female

Answer

To solve the question, we need to identify the hormone 'A' responsible for the disappearance of one of the ducts in a 5-week-old embryo and determine the sex of the embryo based on this information.

### Step-by-Step Solution:

1. **Understanding the Ducts**: At 5 weeks, the embryo possesses both Wolffian (mesonephric) and Müllerian (paramesonephric) ducts. These ducts are crucial in determining the sexual differentiation of the embryo.

**Hint**: Recall the roles of the Wolffian and Müllerian ducts in male and female reproductive systems.

2. **Hormonal Influence on Ducts**: As the embryo develops, specific hormones influence the fate of these ducts. In male embryos, the presence of certain hormones leads to the regression of the Müllerian duct.

**Hint**: Think about which hormones are involved in male sexual differentiation and their effects on the ducts.

3. **Identifying Hormone 'A'**: The hormone responsible for the regression of the Müllerian duct is the Anti-Müllerian Hormone (AMH). This hormone is secreted by the Sertoli cells of the testes.

**Hint**: Consider the function of AMH in male embryos and its role in duct regression.

4. **Outcome of Duct Regression**: Since the Müllerian duct regresses due to the secretion of AMH, the Wolffian duct will persist, leading to the development of male reproductive structures.

**Hint**: Reflect on what happens to the Wolffian duct when the Müllerian duct is absent.

5. **Determining the Sex of the Embryo**: With the regression of the Müllerian duct and the presence of the Wolffian duct, the sex of the embryo will be male.

**Hint**: Connect the presence of the Wolffian duct and the absence of the Müllerian duct to the male sex determination.

### Final Answer:
The hormone 'A' is Anti-Müllerian Hormone (AMH), and the sex of the embryo in the future will be male.