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': 'A compound serving a link between citric acid cycle and urea cycle is: \nSelect and explain. \nA. Malate, B. Citrate, C. Succinate, D. Fumarate', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The fumarate formed may be funnelled into TCA cycle to be converted to malate and then to oxaloacetate to be transaminated to aspartate. Thus, the urea cycle is linked to TCA cycle through fumarate.\nReference: Vasudevan 7th\xa0 ed, pg 204', 'role': 'assistant'}]