(A) Vitamin $A$ (retinol) was the first vitamin to be discovered. It was identified by Elmer McCollum and Marguerite Davis in $1913$ while they were s

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(A) Vitamin $A$ (retinol) was the first vitamin to be discovered. It was identified by Elmer McCollum and Marguerite Davis in $1913$ while they were studying the nutritional requirements of rats. They initially referred to it as 'fat-soluble factor $A$' to distinguish it from the water-soluble 'factor $B$'.