Hepatitis B vaccine is

Options

A. Combined vaccine
B. Recombinant antigen vaccine
C. Polysaccharide vaccine
D. DNA vaccine

Answer

### Step-by-Step Solution:

1. **Definition of Hepatitis B Vaccine**: The Hepatitis B vaccine is a type of vaccine specifically designed to prevent Hepatitis B infection.

2. **Type of Vaccine**: It is classified as a recombinant vaccine. This means that it is produced using recombinant DNA technology.

3. **Active Component**: The active component of the Hepatitis B vaccine is the Hepatitis B surface antigen (HBsAg). This antigen is crucial for stimulating an immune response in the body.

4. **Production Method**: The Hepatitis B surface antigen is produced in yeast cells. Yeast is a type of fungus, and in this case, it is genetically modified to produce the HBsAg.

5. **Purpose of the Vaccine**: The primary purpose of the Hepatitis B vaccine is to provide immunity against the Hepatitis B virus, thereby preventing liver diseases associated with the infection.

6. **Administration**: The vaccine is administered to individuals, especially those at risk of Hepatitis B infection, to help prevent the disease.

7. **Conclusion**: The Hepatitis B vaccine is a recombinant antigen vaccine produced in yeast cells, aimed at preventing Hepatitis B infection and its associated liver problems.