Question: A 50-year-old patient with a pleural effusion with the following characteristics: straw appearance, pH 7.3, ratio of pleura / serum proteins 0.8, ratio of LDH pleura / serum 0.9, Gram and Ziehl negative, total lipids, cholesterol and normal triglycerides, cells mesothelial <5%, intense lymphocytosis without atypia, ADA 64 U / l. What diagnosis do you suggest? 
 Options:  <1> Pleural empyema <2> Pleural effusion due to heart failure (transudate). <3> Pleural mesothelioma. <4> Tuberculous pleural effusion <5> Secondary effusion to pulmonary infarction.
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