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What did Dr. John A. Hopps invent?

  1. The first electric light bulb

  2. The radio

  3. The first cardiac pacemaker

  4. The worldwide system of standard time zones

The correct answer is: The first cardiac pacemaker

Dr. John A. Hopps is credited with inventing the first cardiac pacemaker in 1950. Option A is incorrect because Thomas Edison invented the first electric light bulb in 1879. Option B is incorrect because Guglielmo Marconi is credited with inventing the radio in the late 19th century. Option D is incorrect because the worldwide system of standard time zones was proposed by Sir Sandford Fleming in 1879, long before Dr. Hopps' invention of the pacemaker.