Which two monosaccharides form maltose?

Maltose is a disaccharide that forms from the condensation reaction between two monosaccharide units. Specifically, it is composed of two glucose molecules linked together by an α(1→4) glycosidic bond. This means that the correct combination of monosaccharides to create maltose is indeed two glucose molecules.

In the context of the other choices, the other pairings do not yield maltose. For example, glucose and fructose make sucrose, while galactose and glucose produce lactose. Fructose and galactose also do not combine to form maltose. Therefore, the only correct pairing that results in the formation of maltose is that of two glucose units, underscoring the accuracy of the answer.