Sir Frederick Banting discovered insulin, which has saved millions of lives.

Discover Canada records this in one direct passage about insulin. The guide writes: Sir Frederick Banting of Toronto and Charles Best discovered insulin, a hormone to treat diabetes that has saved 16 million lives worldwide. The status the test wants is therefore true — Sir Frederick Banting (with Charles Best) discovered insulin, which has saved millions of lives.

Four precise commitments. Discover Canada commits the insulin discovery to FOUR specific facts: (1) the discoverers were Sir Frederick Banting of Toronto and Charles Best; (2) the discovery was of insulin; (3) insulin is a hormone to treat diabetes; (4) it has saved 16 million lives worldwide. So the source pinpoints the named discoverers, the named substance, the named medical purpose, and the named lives-saved figure.

The named discovery is one of Canada's greatest medical achievements. Discover Canada commits insulin to a specific named global impact: "saved 16 million lives worldwide." So the named insulin discovery has had global humanitarian consequences far beyond Canada — making Banting and Best's named work one of the most consequential medical achievements of the 20th century.

The named insulin discovery sits within Canada's wider scientific tradition. Discover Canada commits Canadian discoveries and inventions to a specific named list. Among the named Canadian inventors are Alexander Graham Bell (the telephone), Reginald Fessenden (wireless radio), Dr. Wilder Penfield (pioneering brain surgery at McGill University in Montreal — known as "the greatest living Canadian"), Sir Sandford Fleming (standard time zones), Dr. John A. Hopps (the cardiac pacemaker), and Mike Lazaridis and Jim Balsillie of Research in Motion (the BlackBerry). So Banting and Best's insulin discovery joins the named pantheon of Canadian inventors and researchers whose work has shaped the modern world. The named scientific tradition is part of Canada's broader cultural and educational heritage. So when the test asks whether Sir Frederick Banting discovered insulin and saved millions of lives, the source-precise answer is true.

The question is testing whether new citizens know about Banting's named insulin discovery. Discover Canada commits to one direct named achievement: Sir Frederick Banting of Toronto and Charles Best discovered insulin, a hormone to treat diabetes that has saved 16 million lives worldwide. The right test answer matches that — true.

The wrong answer ("False") reverses the source — Sir Frederick Banting (with Charles Best) DID discover insulin, and it HAS saved millions of lives. Only the true answer matches the source.