Which of the following statements is correct:

Options

A. Hepatitis B virus (HBV) can be transmitted through blood transfusion, sexual contact, saliva, tears, intravenous drug abuse, tatooing, ear and nose pierceing, sharing of rozors etc
B. Hepatitis B virus vaccine is the second generation vaccine produced from transgenic yeast by recombinant DNA technology
C. Heptitis B virus vaccine is the first commercially available human vaccine produced by genetic engineering
D. all of these

Answer

D