The primary organ that converts fructose to glucose following absorption is the liver.

Here's why:

* Fructose Absorption: Fructose is absorbed into the bloodstream from the small intestine.

* Liver's Role: The liver is the main site of fructose metabolism. It contains the enzymes necessary to convert fructose into glucose.

* Conversion Process: The liver converts fructose to glucose through a multi-step process involving enzymes like fructokinase and aldolase B.

While other tissues can utilize fructose to a small extent, the liver is the primary organ responsible for its conversion to glucose.