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: Medicine
[{'content': "In which of the following conditions is cardiac involvement NOT a usual feature ? \nSelect and explain. \nA. Facio-scapulo-humeral dystrophy, B. Duchenne's muscular dystrophy, C. Friedreich's ataxia, D. Myotonic dystrophy", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]