Proteins are normally present in :

Options

A. plasma only
B. urine only
C. glomerular filtrate and urine only
D. plasma, glomerular filtrate and urine

Explanation

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks where proteins are normally present in the human body. The options provided include plasma, urine, glomerular filtration, and a combination of these.

2. **Identifying Plasma Proteins**: In the human body, proteins such as globulins and albumins are classified as plasma proteins. Globulins are the second most common type of plasma protein.

3. **Analyzing Each Option**:
- **Plasma**: This is the liquid component of blood where various proteins, including globulins, are dissolved. Since globulins are plasma proteins, they are normally present in plasma.
- **Urine**: Normally, proteins are not present in urine in significant amounts. The kidneys filter blood, and proteins are usually too large to pass through the filtration barrier into the urine.
- **Glomerular Filtration**: This refers to the process by which blood is filtered in the kidneys. While some small proteins may pass through, under normal conditions, significant amounts of proteins should not be present in the filtrate.
- **Combination of Options**: Since proteins are primarily found in plasma, the combination options would also not be correct.

4. **Conclusion**: Based on the analysis, the correct answer is that proteins are normally present in **plasma**.

### Final Answer:
**Proteins are normally present in: Plasma (Option A)**

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