Chorion is found

Options

A. Inside the amnion
B. Outside the amnion
C. Inside the allantois
D. Inside the yolk sac

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the location of the chorion in relation to other embryonic membranes such as the amnion, allantois, and yolk sac.

2. **Identifying Embryonic Membranes**: The main embryonic membranes involved in human development are the chorion, amnion, allantois, and yolk sac. Each has distinct functions and locations.

3. **Locating the Chorion**: The chorion is an outer membrane that surrounds the embryo and is involved in the exchange of gases and nutrients. It plays a crucial role in the formation of the placenta.

4. **Comparing Locations**:
- The **amnion** is a membrane that encases the embryo in amniotic fluid, providing cushioning and protection.
- The **allantois** is involved in waste disposal and gas exchange.
- The **yolk sac** is primarily involved in nutrient supply early in development.

5. **Conclusion**: Based on the relationships between these membranes, the chorion is located outside the amnion. Therefore, the correct answer to the question is that the chorion is found outside the amnion.

**Final Answer**: The chorion is found outside the amnion.

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