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 patient with a history of ankle edema, shortness of breath and orthopnea, is probably suffering from: \nSelect and explain. \nA. Asthma, B. Emphysema, C. Cardiac decompensation, D. Constrictive pericarditis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]