Jenner prepared the vaccine for small pox by using

Options :
  1. attenuated pathogen of small pox
  2. smaller doses of small pox virus
  3. attenuated form of cow pox virus
  4. material from cow pox pustule
Answer and Explanation :-

Answer: Option 4

Explanation:

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You may die a hundred deaths without a break in the mental turmoil. Or, you may keep your body and die only in the mind. The death of the mind is the birth of wisdom.
-Sri Nisargadatta Maharaj I Am That: Talks with Sri Nisargadatta Maharaj