Which of the following is responsible for the active immunity

Options :
  1. killer T cells
  2. helper T cells
  3. memory cells
  4. all the above

Answer and Explanation :-

Answer: Option 3


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Everything is determined, the beginning as well as the end, by forces over which we have no control. It is determined for the insect, as well as for the star. Human beings, vegetables, or cosmic dust, we all dance to a mysterious tune, intoned in the distance by an invisible piper.
-Albert Einstein