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: Surgery
[{'content': "Pendred's syndrome is due to a defect in - \nSelect and explain. \nA. Chromosome 7p, B. Chromosome 7q, C. Chromosome 8p, D. Chromosome 8q", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]