Which groundbreaking medical product took the LONGEST time from initial discovery to FDA approval and market launch?

The medical industry sees numerous innovative products each year, but the path from concept to market is uniquely challenging. With strict regulatory requirements, extensive clinical trials, and high stakes for patient outcomes, medical product launches require precision and expertise. Test your knowledge about one of the most significant medical product launches that revolutionized patient care in the last century.

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Insulin (discovered 1921, commercially available 1923)
HPV vaccine Gardasil (research began 1991, FDA approved 2006)
Penicillin (discovered 1928, mass production began 1945)
MRI machines (technology developed 1970s, FDA approved 1984)