question: Q:A 54-year-old man electively underwent an open cholecystectomy for his cholelithiasis. The procedure was performed under general anesthesia with inhaled anesthetic agents after induction with an intravenous agent. The surgeon operated quickly, and the procedure was uncomplicated. As the surgery ended, the anesthesia resident stopped the anesthesia and noticed the oxygen saturation gradually decreasing to 84%. He quickly administers 100% oxygen and the hypoxia improves. Which of the following most likely accounts for the decreased oxygen saturation seen after the anesthesia was stopped in this patient?? 
  {'A': 'Pneumothorax', 'B': 'Cardiotoxicity', 'C': 'Second gas effect', 'D': 'Laryngospasm', 'E': 'Diffusion hypoxia'},