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': "The following are single gene disorders qexcept- \nSelect and explain. \nA. Haemochromatosis, B. Cystic fibrosis, C. William's syndrome, D. Huntington's disease", 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., William's syndrome", 'role': 'assistant'}]