question: Q:You are called to the bedside of a 75-year-old woman, who is post-op day 4 from a right total hip replacement. The patient appears agitated; she is trying to pull out her IV, and for the past 4 hours she has been accusing the nursing staff of trying to poison her. Her family notes that this behavior is completely different from her baseline; she has not shown any signs of memory loss or behavioral changes at home prior to the surgery. You note that she still has an indwelling catheter. She continues on an opioid-based pain regimen. All of the following are potential contributors to the patient’s presentation EXCEPT:? 
  {'A': 'Infection', 'B': 'Polypharmacy', 'C': 'Amyloid accumulation', 'D': 'Volume depletion', 'E': 'Electrolyte abnormalities'},