Fetus gets nourishment and oxygen through

Options

A. allantois
B. placenta
C. yolk sac
D. chorion.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks how the fetus receives nourishment and oxygen during development.

2. **Analyzing the Options**:
- **Allantois**: This structure is involved in gas exchange and waste management but does not primarily provide nourishment and oxygen.
- **Placenta**: The placenta is a vital organ that develops in the uterus during pregnancy. It is responsible for supplying oxygen and nutrients to the fetus and removing waste products.
- **Yolk Sac**: In humans, the yolk sac provides early nutrition and gas exchange before the placenta is formed. Once the placenta is established, its role diminishes significantly.
- **Chorion**: This is the outermost membrane surrounding the embryo and does not directly provide nourishment or oxygen.

3. **Identifying the Correct Answer**: After evaluating all options, the placenta is the structure that primarily provides nourishment and oxygen to the fetus. Therefore, the correct answer is **placenta**.

4. **Conclusion**: The fetus gets nourishment and oxygen through the **placenta**.

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