Question

What is a disaccharide made up of two glucose molecules

Answer 1

For example, milk sugar (lactose) is a disaccharide made by condensation of one molecule of each of the monosaccharides glucose and galactose, whereas the Disaccharide sucrose in sugar cane and sugar beet, is a condensation product of glucose and fructose.
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Answer 2

"Maltose" is the disaccharide that made up of two glucose molecules.
Which means, when maltose dissociates, it get converted into Glucose + Glucose.

Maltose → Glucose + Glucose

So, In short, your answer is "Maltose".

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