A Long and Illustrious History
John MacLeod was a Scottish physician who was the co-discoverer of:
APenicillin
BInsulin ✓
CThe structure of DNA
DThe MRI scanner
Explanation
John MacLeod (1876–1935), a Scottish physician and researcher, was the co-discoverer of insulin, used to treat diabetes. He shared the Nobel Prize in Physiology or Medicine for this discovery.
hardjohn macleodinsulindiscovery
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