This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: TCA Cycle, Subject name: Biochemistry
[{'content': 'Which of the following urea cycle intermediate is the link between urea cycle and TCA cycle? \nSelect and explain. \nA. Argininosuccinate, B. Fumarate, C. Oxaloacetate, D. Succinate', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b) Fumarate is the link between urea cycle and TCA cycle Urea Bicycle = Urea cycle + TCA cycle Both are independent cycles but are linked. 1 nitrogen in the urea is obtained from the aspaate obtained by transamination of oxaloacetate produced in TCA cycle (See fig) The fumarate that is produced in urea cycle can be used as an intermediate in the citric acid cycle.', 'role': 'assistant'}]