question: Q:A 78-year-old man suffers a fall in a nursing home and is brought to the emergency room. A right hip fracture is diagnosed, and he is treated with a closed reduction with internal fixation under spinal anesthesia. On the second postoperative day, the patient complains of pain in the lower abdomen and states that he has not urinated since the surgery. An ultrasound shows increased bladder size and volume. Which of the following is the mechanism of action of the drug which is most commonly used to treat this patient’s condition?? 
  {'A': 'Parasympathetic agonist', 'B': 'Sympathetic agonist', 'C': 'Parasympathetic antagonist', 'D': 'Alpha-blocker', 'E': 'Beta-blocker'},