This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
[{'content': 'Urea cycle is linked to TCA cycle by ? \nSelect and explain. \nA. Arginine, B. Ornithine, C. Oxaloacetate, D. Fumarate', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Fumarate Fumarate is released during urea cycle, which is an intermediate of Kreb's cycle, thus linking the two.", 'role': 'assistant'}]