First discovered hormone

Thyroxine

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Adrenaline

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Secretin

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Insulin

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Solution

The correct option is C Secretin
Wm. M. Bayliss and Ernest H. Starling discovered secretin, the first hormone, in 1902. They discovered this hormone when they were studying the pancreatic secretion. Secretin hormone stimulates the pancreas to secrete digestive fluid.

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