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': 'Which of the following is false about alkaptonuria? \nSelect and explain. \nA. Genitourinary system not involved, B. Homogentisic acid oxidase deficiency, C. Black urine, D. Calcification in vertebral bodies', 'role': 'user'}, {'content': "Answer: A \nExplanation: a. Genitourinary system not involved(Ref: Nelson's 20/e p 636-642, Ghai 8/e p 653-655)Genitourinary system is also involved in Alkaptonuria, as this enzyme is expressed only in liver and kidneys; darkening of urine on standing is an important feature of Alkaptonuria.", 'role': 'assistant'}]