The hormone secreted by kidney is
(a) Gastrin
(b) Secretin
(c) Erythropoietin
(d) Aldosterone

Options

A. Gastrin
B. Secretin
C. Erythropoietin
D. Aldosterone

Answer

To solve the question "The hormone secreted by kidney is", we need to analyze each of the options provided:

1. **Understanding the Question**: The question asks for the hormone that is specifically secreted by the kidneys.

2. **Reviewing the Options**:
- **(a) Gastrin**: This hormone is primarily produced in the stomach and is involved in the digestive process. It is not secreted by the kidneys.
- **(b) Secretin**: This hormone is produced by the small intestine and helps regulate water homeostasis and the secretion of digestive fluids. It is not secreted by the kidneys.
- **(c) Erythropoietin**: This is a hormone produced by the kidneys. It stimulates the production of red blood cells (RBCs) in response to low oxygen levels in the blood (hypoxia).
- **(d) Aldosterone**: This hormone is produced by the adrenal glands (not the kidneys) and is involved in regulating sodium and potassium levels in the blood.

3. **Identifying the Correct Answer**: Based on the analysis, the only hormone that is secreted by the kidneys is **Erythropoietin** (option c).

4. **Conclusion**: Therefore, the correct answer to the question is **(c) Erythropoietin**.