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': 'Left-sided pleural effusion seen in -a) Pancreatitisb) Rheumatoid arthritisc) Hypoproteinemiad) CCFe) Esophageal rupture \nSelect and explain. \nA. a, B. ae, C. ab, D. ad', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]