Blood cells are produced by Red bone marrow.
choose incorrect option `:-`

Options

A. All platelets
B. All erythrocytes
C. All leukocytes
D. None

Answer

To solve the question regarding which option is incorrect about blood cell production in the red bone marrow, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Function of Red Bone Marrow**:
- Red bone marrow is primarily responsible for the production of blood cells, including red blood cells (erythrocytes), white blood cells (leukocytes), and platelets.

2. **Evaluate Each Option**:
- **Option 1: All Platelets**: This option states that all platelets are produced in red bone marrow. This is correct, as platelets are indeed formed from megakaryocytes in the red bone marrow.
- **Option 2: All Erythrocytes**: This option claims that all erythrocytes (red blood cells) are produced in red bone marrow. This is also correct, as erythrocytes originate from stem cells in the red bone marrow.
- **Option 3: All Leukocytes**: This option states that all leukocytes (white blood cells) are produced in red bone marrow. This is incorrect because while a significant portion of leukocytes, particularly lymphocytes, are produced in red bone marrow, not all leukocytes originate there. Some leukocytes, especially certain types of lymphocytes, mature in other lymphatic tissues such as the thymus and lymph nodes.
- **Option 4: None**: This option suggests that none of the previous statements are incorrect. Since we have identified that the statement regarding leukocytes is incorrect, this option is also not valid.

3. **Identify the Incorrect Option**:
- Based on the evaluation, the incorrect option is **"All Leukocytes"**, as not all leukocytes are produced in red bone marrow.

### Final Answer:
The incorrect option is **"All Leukocytes"**.

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