Edward Jenner is known for the discovery of ----------

Options :
  1. BCG
  2. immunization against polio
  3. vaccination of smallpox
  4. none of these
Answer and Explanation :-

Answer: Option 3

Explanation:

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I felt as if I were walking with destiny, and that all my past life had been but a preparation for this hour and for this trial... I thought I knew a good deal about it all, I was sure I should not fail.
-Winston Churchill The Second World War