Which is correct ?

Options

A. Blood has WBCs and lymph has RBCs
B. Blood has WBCs and RBCs and lymph has neither WBCs nor RBCs
C. Blood has RBCs and WBCs and lymph has WBCs only
D. Lymph has WBCs and RBCs and blood has RBCs only

Answer

To determine which statement about blood and lymph is correct, we can analyze the components of each fluid based on the information provided.

### Step-by-Step Solution:

1. **Understanding Blood Composition**:
- Blood is composed of two main components: plasma and formed elements.
- The formed elements include Red Blood Cells (RBCs), White Blood Cells (WBCs), and platelets.
- Therefore, blood contains both RBCs and WBCs.

2. **Understanding Lymph Composition**:
- Lymph is a fluid that is derived from blood plasma and runs through lymphatic vessels.
- The major components of lymph include WBCs, water, proteins, salts, and fats.
- Importantly, lymph does not contain RBCs.

3. **Evaluating the Options**:
- **Option 1**: "Blood has WBCs and lymph has RBCs."
- Incorrect, because lymph does not contain RBCs.
- **Option 2**: "Blood has WBCs and RBCs; lymph has neither WBC nor RBC."
- Incorrect, because lymph contains WBCs.
- **Option 3**: "Blood has RBCs and WBCs; lymph has WBCs only."
- Correct, because blood contains both RBCs and WBCs, while lymph contains only WBCs.
- **Option 4**: "Lymph has WBCs and RBCs; blood has RBCs only."
- Incorrect, because lymph does not contain RBCs.

4. **Conclusion**:
- The correct statement is: "Blood has RBCs and WBCs; lymph has WBCs only."

### Final Answer:
**Option 3 is correct**: "Blood has RBCs and WBCs; lymph has WBCs only."

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