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': "Dullness on percussion in the Traube's semilunar area denotes: \nSelect and explain. \nA. Cardiomegaly, B. Splenomegaly, C. Hepatomegaly, D. All of the above", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]