Which of the following statements is true for lymph ?

Options

A. WBC and serum
B. All components of blood except RBCs, Platelets and some proteins
C. RBCs, WBCs and Plasma
D. RBCs, Proteins and Platelets

Answer

### Step-by-Step Solution:

1. **Understanding Lymph Composition**: Lymph is a fluid that is part of the lymphatic system. It is similar to blood plasma but contains a higher concentration of white blood cells (WBCs) and fewer proteins compared to blood.

2. **Color of Lymph**: Lymph is typically a pale yellow color. This coloration is due to the absence of red blood cells (RBCs) and platelets, which are present in blood but not in lymph.

3. **Components of Lymph**: The main components of lymph include:
- White blood cells (especially lymphocytes, which play a crucial role in the immune response)
- Proteins (though in lower concentrations than in blood)
- Fats (especially after a meal, when lymph can appear milky due to the presence of chyle)
- Carbohydrates and nitrogenous bases (in trace amounts)

4. **Defense Mechanism**: Lymph plays a vital role in the body’s defense mechanism. The lymphatic system helps in transporting WBCs to and from lymph nodes, where they can respond to pathogens.

5. **Evaluating Statements**: Given the statements about lymph:
- Lymph is a component of blood except for RBCs and platelets – This is true.
- Lymph contains RBCs, proteins, and platelets – This is false because lymph does not contain RBCs or platelets.
- Lymph contains WBCs and serum – This is true, but it is not the most comprehensive statement.
- Lymph contains WBCs, serum, and plasma – This is false because plasma is not a component of lymph.

6. **Conclusion**: The most accurate statement regarding lymph is that it is a component of blood except for RBCs and platelets.

### Final Answer:
The true statement for lymph is: "Lymph is a component of blood except for RBCs and platelets."

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