(C) The first hormone to be discovered was $Secretin$. It was identified by $William \text{ } Bayliss$ and $Ernest \text{ } Starling$ in $1902$. They

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(C) The first hormone to be discovered was $Secretin$. It was identified by $William \text{ } Bayliss$ and $Ernest \text{ } Starling$ in $1902$. They observed that the presence of acid in the duodenum triggered the release of a substance into the blood that stimulated the pancreas to secrete digestive juices.