In human, placental villi are derived from

Options

A. Chorion
B. Allantois
C. Yolk sac
D. Amnion

Answer

To solve the question "In human, placental villi are derived from?" we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Placental Villi**:
- Placental villi, also known as chorionic villi, are finger-like projections that form part of the placenta. They play a crucial role in nutrient and gas exchange between the mother and the fetus.

2. **Identifying the Source**:
- The question asks where these villi are derived from. To answer this, we need to identify the embryonic structure that gives rise to the chorionic villi.

3. **Analyzing the Options**:
- **Option A: Chorion**: The chorion is the outermost membrane surrounding the embryo and is responsible for forming the placenta. It develops chorionic villi.
- **Option B: Allantois**: The allantois is involved in waste storage and does not form the villi.
- **Option C: Yolk Sac**: The yolk sac provides nutrients in early development but does not form the villi.
- **Option D: Amnion**: The amnion is a membrane that surrounds the embryo, providing cushioning, but it does not form the villi.

4. **Conclusion**:
- Based on the analysis, the correct answer is **Option A: Chorion**, as it is the structure from which placental villi are derived.

### Final Answer:
**Chorion**

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