Kidneys are

Options

A. Ectodermal
B. Mesodermal
C. Endodermal
D. None of the above

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the embryonic origin of kidneys. We need to identify which germ layer (ectoderm, mesoderm, or endoderm) the kidneys develop from during embryonic development.

2. **Identifying Germ Layers**:
- **Ectoderm**: This layer gives rise to structures such as the brain, spinal cord, and sensory organs (e.g., eyes, hair).
- **Mesoderm**: This layer is responsible for developing structures such as the heart, blood cells, gonads, and kidneys.
- **Endoderm**: This layer forms the gastrointestinal tract and associated glands like the pancreas and liver.

3. **Analyzing the Options**:
- **Option A (Ectodermal)**: Incorrect, as kidneys do not develop from the ectoderm.
- **Option B (Mesodermal)**: Correct, as kidneys originate from the mesoderm.
- **Option C (Endodermal)**: Incorrect, since the endoderm does not give rise to kidneys.
- **Option D (None of the above)**: Incorrect, as we have identified the correct origin.

4. **Conclusion**: Based on the analysis, the correct answer is **Option B: Mesodermal**.

**Final Answer**: B. Mesodermal

---