This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, Subject name: ENT
[{'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: Pendred disease is an autosomal recessive disorder leading to congenital bilateral sensorineural hearing loss and goitre with euthyroid or mild hypothyroidism. It has been linked to mutations in the PDS gene, which codes for the pendrin protein. The gene is located on the long arm of chromosome 7 (7q) Ref : Dhingra 7e pg 130.', 'role': 'assistant'}]