Jenner used fluid from the pustule of _________ to prepare a vaccine for small pox

Jenner used fluid from the pustule of _________ to prepare a vaccine for small pox.

  1. A

    Cowpox infected cow    

  2. B

    Cowpox infected dairymaid 

  3. C

    Healthy dairymaid

  4. D

    Smallpox infected dairymaid

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