Glycoproteinaceous hormone is

Options

A. Erythropoietin
B. Insulin
C. Oxytocin
D. Relaxin.

Answer

### Step-by-Step Solution:

1. **Understanding Glycoproteinaceous Hormones**:
- Glycoproteinaceous hormones are hormones that are primarily proteins (or peptides) but also contain carbohydrate moieties. This means they are composed of amino acids and have sugar molecules attached to them.

2. **Identifying the Given Options**:
- The options provided are:
- A) Erythropoietin
- B) Insulin
- C) Oxytocin
- D) Relaxin

3. **Analyzing Each Option**:
- **Erythropoietin**: This hormone is known to be a glycoprotein. It is secreted by the juxtaglomerular cells of the kidney and plays a crucial role in stimulating the production of red blood cells (RBCs) in the bone marrow.
- **Insulin**: This is a peptide hormone that regulates glucose levels in the blood but does not have a carbohydrate moiety, hence it is not a glycoprotein.
- **Oxytocin**: Similar to insulin, oxytocin is a peptide hormone involved in various functions like childbirth and lactation, but it also lacks carbohydrate moieties.
- **Relaxin**: This is another peptide hormone that helps in childbirth but does not contain carbohydrate components.

4. **Conclusion**:
- Among the options, only **erythropoietin** qualifies as a glycoproteinaceous hormone due to its structure that includes both protein and carbohydrate components.

5. **Final Answer**:
- The correct answer is **A) Erythropoietin**.