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': 'Which protein is defective in dilated Cardiomyopathy? \nSelect and explain. \nA. Actin, B. Myosin, C. Troponin, D. Dystrophin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: One of the cause is mutations in dystrophin.', 'role': 'assistant'}]