This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Inborn Errors of Metabolism, Subject name: Pediatrics
[{'content': "Wilson's disease is caused by defect in: \nSelect and explain. \nA. ATP 7A mutation, B. ATP 7B mutation, C. Ceruloplasmin, D. ATP 7C mutation", 'role': 'user'}, {'content': "Answer: B \nExplanation: b. ATP 7B mutation(Ref: Nelson's 20/e p 1939-1940, Ghai 8/e p 320-321)The abnormal gene for Wilson disease is ATP7B on long arm of chromosome 13 (13q14.3)", 'role': 'assistant'}]