A 32 year old man working in a shipyard comes with SOB (shortness of breath). Examination: dullness on left side of the chest, pain in left side of chest, pleuritic rub and crackles been heard on the same side. What is the single most likely diagnosis?

The key is C. Pleural effusion. [Shipyard worker are exposed to asbestos and presenting case has developed mesothelioma causing pleura thickening and pleural effusion. Though it is usual that in pleural effusion pleural rub reduces or becomes absent but it is also possible to get pleural rub even in pleural effusion and the like diagnosis is pleural effusion here].