A 20 years old male presented with fever, cough with sputum and chest pain since 6 days. Patient also had moderate dyspnea since last 2 days. His complete blood count showed markedly elevated WBCs with neutrophilia. a) What is the provisional diagnosis. (2 Marks) b)Enumerate the etiologies of the diagnosis. (2 Marks) c)Write briefly the various modalities of investigations to diagnose this disease. (3 Marks) d)Describe stages of the disease with diagrammatic representation. (5 Marks)