How does fumarate produced in the urea cycle integrate into the citric acid cycle?

• A. Fumarate is converted to malate, which then enters the citric acid cycle
• B. Fumarate is directly used in the citric acid cycle without conversion
• C. Fumarate acts as a cofactor for enzymes in the citric acid cycle
• D. Fumarate is converted into acetyl-CoA for entry into the citric acid cycle

Answer: (A)