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: Biochemistry
[{'content': 'Which of the following gives a positive reaction with Ferric chloridea) Phenylketonuriab) Alkaptonuriac) Maple syrup urine disease d) None \nSelect and explain. \nA. ac, B. a, C. ad, D. ab', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ferric chloride test is positive in phenylketonuria and also in alkaptonuria.', 'role': 'assistant'}]