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: Pathology
[{'content': 'Phenylketonuria is ? \nSelect and explain. \nA. AD, B. AR, C. X linked dominant, D. X linked recessive', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is `b' i.e., AR", 'role': 'assistant'}]