This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of protein and amino acid, Subject name: Biochemistry
[{'content': 'Krebs cycle and Urea cycle are linked at \nSelect and explain. \nA. Ornithine, B. Fumarate, C. Oxaloacetate, D. Arginine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Reference: Harpers illustrated biochemistry 30th edition', 'role': 'assistant'}]