This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Medicine
[{'content': "All the following in the Light's criteria are suggestive of exudative pleural effusion EXCEPT \nSelect and explain. \nA. Pleural fluid protein :serum protein ratio> 0.5, B. Pleural fluid ADA< 16, C. Pleural fluid LDH : serum LDH ratio> 0.6, D. Pleural fluid LDH >two thirds of the upper limit of serum LDH", 'role': 'user'}, {'content': "Answer: B \nExplanation: Light's criteria is used for distinguishing pleural transudate from exudate.Exudate is likely if one or more of the following criteria are met:-(a)Pleural fluid protein:Serum protein ratio>0.5;(b)Pleural fluid LDH:Serum LDH ratio>0.6;(c)Pleural fluid LDH>two-thirds of the upper limit of normal serum LDH. Reference:Davidson's medicine-22nd edition,page no:662.", 'role': 'assistant'}]