question: Q:A 27-year-old man presents to the emergency room complaining of shortness of breath and productive cough for a few days. He says that his sputum is mostly yellow with tiny red specks. He denies fever, chills, recent weight loss, or joint pain. He has no history of recent travel or sick contacts.  His medical history is unremarkable. He smokes a pack of cigarettes daily. He has had 3 sexual partners in the past year. His temperature is 37°C (98.6°F), blood pressure is 110/70 mm Hg, pulse is 98/min, and respirations are 20/min. On physical examination, the patient is in mild respiratory distress. Cardiopulmonary auscultation reveals diffuse bilateral rales. An HIV test is negative. His laboratory results are as follow:
  Complete blood count
  Hemoglobin 12 gm/dL
  Serum chemistry
  Sodium 143 mEq/L
  Potassium 4.1 mEq/L
  Chloride 98 mEq/L
  Bicarbonate  22 mEq/L
  Blood urea nitrogen 26 mg/dL
  Creatinine 2.3 mg/dL
  Glucose  86 mg/dL
  Urine dipstick
  Protein trace
  Blood positive
  Leukocytes negative
  Nitrates negative
  Which of the following is the most likely cause of his current condition?? 
  {'A': 'Pneumocystis pneumonia', 'B': 'Pulmonary embolism', 'C': 'Heart failure', 'D': 'Basement membrane antibodies', 'E': 'Ruptured alveolar bleb'},