Erythropoiesis starts in

Options

A. liver
B. Spleen
C. Red bone marrow
D. Kidney

Explanation

### Step-by-Step Solution:

1. **Understanding Erythropoiesis**:
- Erythropoiesis is the process of producing red blood cells (RBCs), also known as erythrocytes. The term "erythro" refers to red, while "poiesis" means to make or produce.

2. **Identifying the Origin of Erythropoiesis**:
- Erythropoiesis primarily occurs in specific organs during different stages of development. In the early stages of fetal development, it starts in the liver.

3. **Evaluating the Options**:
- The options provided are:
- A) Liver
- B) Spleen
- C) Red Bone Marrow
- D) Kidney
- Among these, the liver is known to be the primary site for erythropoiesis during fetal development.

4. **Conclusion**:
- Therefore, the correct answer to the question "Erythropoiesis starts in" is **Option A: Liver**.