question: Q:A 37-year-old woman undergoes diagnostic laparoscopy under general anesthesia for evaluation of chronic pelvic pain. Postoperatively, the patient requires prolonged intubation. Neostigmine is administered. Results of acceleromyography during train-of-four ulnar nerve stimulation are shown. Which of the following drugs is most likely to have been used preoperatively in this patient?? 
  {'A': 'Clonazepam', 'B': 'Ropivacaine', 'C': 'Rocuronium', 'D': 'Tizanidine', 'E': 'Succinylcholine'},