Which of the following is correct?

Options

A. Serum = Blood + fibrinogen
B. Lymph = Plasma + RBC + WBC
C. Blood = Plasma + RBC + WBC
D. Plasma = Blood - Lymphocytes

Answer

To solve the question "Which of the following is correct?", we need to analyze the options provided and identify the correct statement regarding blood, lymph, and their components.

### Step-by-Step Solution:

1. **Understanding Blood Composition**:
- Blood is composed of several components: red blood cells (RBCs), white blood cells (WBCs), platelets, and plasma.
- Plasma is the liquid portion of blood that contains water, electrolytes, proteins (including fibrinogen), hormones, and waste products.

2. **Analyzing the Options**:
- **Option A**: "Blood is equal to blood plus fibrinogen."
- This statement is incorrect because it does not accurately describe the components of blood.
- **Option B**: "Lymph is equal to plus, plus RBC plus WBC."
- This statement is misleading as lymph does not contain RBCs; it primarily consists of lymphocytes and other immune cells.
- **Option C**: "Blood is equal to plasma plus RBC plus WBC."
- This statement is correct because blood is indeed made up of plasma (which includes proteins like fibrinogen) and cellular components (RBCs and WBCs).
- **Option D**: "Plasma is equal to blood and lymphocytes."
- This statement is incorrect because plasma is a component of blood and does not include lymphocytes as a separate entity.

3. **Identifying the Correct Answer**:
- After analyzing all the options, we find that **Option C** is the correct statement: "Blood is equal to plasma plus RBC plus WBC."

### Final Answer:
The correct statement is: **Blood is equal to plasma plus RBC plus WBC.**

---