The most modern technique of vaccine preparation is

Options :
  1. extraction of antigens from pathogens
  2. multiplication of antigens through DNA technique
  3. Weakening of pathogen through chemical treatment
  4. attenuation of pathogen through heat
Answer and Explanation :-

Answer: Option 2

Explanation:

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Mistakes are, after all, the foundations of truth, and if a man does not know what a thing is, it is at least an increase in knowledge if he knows what it is not.
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