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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There's an old joke - um... two elderly women are at a Catskill mountain resort, and one of 'em says, "Boy, the food at this place is really terrible." The other one says, "Yeah, I know and such small portions." Well, that's essentially how I feel about life - full of loneliness, and misery, and suffering, and unhappiness, and it's all over much too quickly.
-Woody Allen Annie Hall: Screenplay