Glucose + glucose —> by glucose + glucose —> by cellulose + water hydrolysis maltose + water dehydration synthesis starch + water dehydration synthesis lactose + water hydrolysis sucrose + water dehydration synthesis

I believe the correct answer is the second option. Maltose and water would be formed from the reaction of two glucose molecules. This reaction is called the dehydration synthesis reaction. The production of water signifies that it is a dehydration reaction. It is a reaction which involves putting together two molecules while losing water molecules. Polymers can be formed from this type of reaction. Some polymers are complex carbohydrates, proteins and nucleic acids. It is also considered as a condensation reaction because two molecules are being condensed into a larger molecule and losing a small molecule which is the water.

An egg, or a sack of flour