This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of nucleic acids, Subject name: Biochemistry
[{'content': 'In urea cycle which defect is an X linked disease \nSelect and explain. \nA. Ornithine transcarbamylase, B. Aspaate transcarbamylase, C. Arginase, D. Argininosuccinate synthase', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Rest all are autosomal disease Ref-Harpers illustrated biochemistry 30/e p650', 'role': 'assistant'}]