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': "Which of the following is a polygenic disorder \nSelect and explain. \nA. Ankylosing spondylitis, B. Huntington's disease, C. Fragile X syndrome, D. Pendred syndrome", 'role': 'user'}, {'content': 'Answer: A \nExplanation: . Ankylosing spondylitis', 'role': 'assistant'}]