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  1. Which year was the world's first chickenpox vaccine rolled out?

    2. A.
    1986
    B.
    1975
    C.
    1981
    D.
    1969

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    Answer : Option A

    Explanation :

    The Research Foundation for Microbial Diseases began the rollout of the world's first chickenpox vaccine in 1986 as the only varicella vaccine approved by the World Health Organisation.

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