A 45 year old man presents to the ED complaining of substernal chest pain that worsens with inspiration for the past 1 week. Patient reports the pain is worse at night when he tries to go to sleep but seems to improve when he sits up. Patient notes he recently tested positive for the flu and was starting to feel better before the chest pain started. The only significant diagnostic finding is elevated WBCs. What is the most likely diagnosis for this patient?a. Acute bacterial pericarditisb. Acute viral pericarditisc. Chronic constrictive pericarditisd. Acute TB pericarditis

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