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  1. What did cardiologist Dr. Paul Zoll invent in Massachusetts in 1952?

    2. A.
    EKG
    B.
    Artificial heart valve
    C.
    Artificial heart
    D.
    Pacemaker

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    Workspace

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    Answer : Option D

    Explanation :

    The pacemaker is an electrical device that regulates the heartbeat.

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