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: Pediatrics
[{'content': 'Wilson disease is caused by defect in \nSelect and explain. \nA. ATP 7A mutation, B. ATP 6A mutation, C. ATP 6B mutation, D. ATP 7B mutation', 'role': 'user'}, {'content': 'Answer: D \nExplanation: ATP 7B gene on chromosome 13 is mutated in Wilson disease.', 'role': 'assistant'}]