Vaccines are

Options :
  1. short lived
  2. MHC proteins
  3. treated bacteria or viruses, or one of their proteins
  4. all the above
Answer and Explanation :-

Answer: Option 3

Explanation:

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Man cannot possess anything as long as he fears death. But to him who does not fear it, everything belongs. If there was no suffering, man would not know his limits, would not know himself.
-Leo Tolstoy War and Peace