Platelets are produced from  

Options

A. Reticulocytes
B. Lymphocyte progenitors
C. Megakaryocytes
D. dendritic cells

Answer

### Step-by-Step Solution:

1. **Understanding Platelets**: Platelets, also known as thrombocytes, are small, colorless cell fragments in the blood that play a crucial role in clotting and preventing bleeding.

2. **Location of Production**: Platelets are produced in the bone marrow, which is a spongy tissue found inside bones. The bone marrow contains stem cells that differentiate into various blood cells.

3. **Role of Megakaryocytes**: The specific cells responsible for the production of platelets are called megakaryocytes. These are large cells with a lobulated nucleus.

4. **Process of Platelet Formation**: The process by which platelets are formed from megakaryocytes is known as thrombopoiesis. During this process, the megakaryocytes release small fragments that become platelets.

5. **Evaluating Other Options**:
- **Reticulocytes**: These are immature red blood cells and do not produce platelets.
- **Lymphocyte Progenitors**: These cells give rise to lymphocytes, not platelets.
- **Dendritic Cells**: These are antigen-presenting cells derived from monocytes and do not produce platelets.

6. **Conclusion**: The correct answer to the question "Platelets are produced from" is **megakaryocytes**.