question: Q:A 73-year-old female is hospitalized following a pelvic fracture. She undergoes surgical repair without complication. Four days into her hospital stay, she develops acute dyspnea and chest pain accompanied by oxyhemoglobin desaturation. Which of the following arterial blood gas values is the patient most likely to have? (normal values: pH 7.35 - 7.45, PaO2 80 - 100 mm Hg, PaCO2 35-45 mm Hg, HCO3 22-26)? 
  {'A': 'pH 7.5, PaO2 60, PaCO2 30, HCO3 22', 'B': 'pH 7.3, PaO2 60, PaCO2 30, HCO3 20', 'C': 'pH 7.5, PaO2 60, PaCO2 50, HCO3 28', 'D': 'pH 7.3, PaO2 60, PaCO2 50, HCO3 24', 'E': 'pH 7.4, PaO2 60, PaCO2 40, HCO3 24'},