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': 'A man was diagnosed to have myositis ossificans progressive at the age of 20 years. He died five years later. What is the most probable cause of his death - \nSelect and explain. \nA. Starvation and chest infection, B. Myocarditis, C. Hypercalcemia, D. Hyperphosphatemia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The\xa0most\xa0common\xa0causes\xa0of\xa0death\xa0in patients with\xa0fibrodysplasia ossificans progressiva\xa0were cardiorespiratory failure from thoracic insufficiency syndrome (54%; median\xa0age, forty-two\xa0years)\xa0and\xa0pneumonia (15%; median\xa0age, fortyyears).', 'role': 'assistant'}]