Which of the following carbohydrates is the end product of the citric acid cycle when it is used to generate energy from acetyl-CoA derived from carbohydrate sources?

The citric acid cycle (also known as the Krebs cycle or tricarboxylic acid cycle) is a key process by which cells generate energy from acetyl-CoA, which can be derived from carbohydrates. Pyruvate is the end product of glycolysis and can be converted into acetyl-CoA to enter the citric acid cycle.