(b) Name the source used to produce hepatitis B vaccine rDNA technology.

Explanation

**Step-by-Step Solution:**

1. **Understanding rDNA Technology**: Recombinant DNA (rDNA) technology is a method used in biotechnology to manipulate the genetic material of living organisms. It involves the introduction of specific genes into a host organism using vectors.

2. **Purpose of rDNA Technology in Vaccines**: In the context of vaccines, rDNA technology allows for the production of specific proteins, such as antigens, that can stimulate an immune response in the human body. This helps in preparing the immune system to fight against pathogens.

3. **Production of Hepatitis B Vaccine**: The hepatitis B vaccine is produced using rDNA technology. This involves inserting the genes that code for the hepatitis B virus's surface antigens into a host organism.

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