<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 45-year-old man presents with 2 weeks of low-grade fever, malaise, night sweats, orthopnea, and shortness of breath. Past medical history is unremarkable. He reports a long-standing history of intravenous drug use for which he has been hospitalized a couple of times in the psychiatry ward. His vital signs upon admission show a blood pressure of 10080 mm Hg, pulse of 102min, a respiratory rate of 20min, and a body temperature of 38.4C 101.0F. On cardiac auscultation, there is an S3 gallop and a 36 holosystolic murmur heard best along the right sternal border. There are fine rattles present over the lung bases bilaterally. Which of the following tests would be of the greatest diagnostic value in this patient?? A: Procalcitonin, B: B-type natriuretic peptide, C: CPK-MB, D: Blood culture, E: C-reactive protein,  <response>: This is a patient with a 2 week history of fever, malaise, night sweats, orthopnea and shortness of breath. He has a history of IV drug use and has been hospitalized for this in the past. On exam he has signs of heart failure including an S3, holosystolic murmur, and rales. The key finding is his history of IV drug use which puts him at risk for endocarditis. Blood cultures would be the best test to diagnose endocarditis in this patient.D: Blood culture 