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': "Congenital Wilson's disease is characterized by: \nSelect and explain. \nA. KF ring is present at birth, B. May present as acute hepatitis, C. Decreased urinary copper excretion, D. Decreased hepatic copper concentration", 'role': 'user'}, {'content': "Answer: B \nExplanation: b. May present as acute hepatitis(Ref: Nelson's 20/e p 1939-1940, Ghai 8/e p 320-321)Kayser-Fleischer rings are absent in young patients with hepatic Wilson disease up to 50% of the time but are present in 95% of patients with neurologic symptoms.", 'role': 'assistant'}]