Final answer:
Glycerol phosphate dehydrogenase is important for NADH production in fructose metabolism.
Step-by-step explanation:
Glycerol phosphate dehydrogenase plays a role in fructose metabolism by catalyzing the oxidation of glyceraldehyde-3-phosphate. It transfers high-energy electrons to NAD+ to produce NADH. This enzyme is involved in the production of NADH, which is important for energy production in the cell. Therefore, the correct answer is (b) NADH production.