Which of the folllowing option is true related to production and functions of a molecule which is a glycoprotein and represented as `H_2L_2`.
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Answer

To solve the question regarding the production and functions of the glycoprotein represented as H2L2, we can follow these steps:

### Step 1: Identify H2L2
- The notation H2L2 refers to the structure of antibodies, which are glycoproteins composed of two heavy chains (H) and two light chains (L).

### Step 2: Understand the Production of Antibodies
- Antibodies are produced by a specific type of white blood cell known as B lymphocytes. When B lymphocytes are activated, they differentiate into plasma cells, which are responsible for the secretion of antibodies.

### Step 3: Determine the Nature of Antibodies
- Antibodies are classified as glycoproteins due to the presence of carbohydrate moieties attached to the protein structure. This glycoprotein nature is crucial for their function in the immune response.

### Step 4: Identify the Function of Antibodies
- One of the key functions of antibodies is opsonization, which enhances the ability of phagocytes to engulf and destroy pathogens. This is an important aspect of the immune response.

### Step 5: Choose the Correct Option
- Based on the information gathered, the correct option related to the production and function of the glycoprotein H2L2 (antibody) is the one that mentions plasma cells and opsonization.

### Final Answer
- The correct answer is **Option 4**, which states that plasma cells are involved in the production of antibodies and that their function includes opsonization.

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