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For what is Dr. John A. Hopps known?

  1. Pioneering brain surgery

  2. Inventing the first cardiac pacemaker

  3. Inventing the Canadarm

  4. Founding Research in Motion

The correct answer is: Inventing the first cardiac pacemaker

Dr. John A. Hopps is known as the inventor of the first cardiac pacemaker. Option A, pioneering brain surgery, may seem like a plausible answer since Hopps was a doctor, but it was actually his colleague, Dr. Wilder Penfield, who pioneered brain surgery. Option C, inventing the Canadarm, is incorrect as Hopps was not involved in the creation of this technology. Option D, founding Research in Motion, is also incorrect as this company was founded by Mike Lazaridis and Douglas Fregin. Hopps was primarily known for his work in medical engineering and the invention of the first pacemaker.