This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Muscle relaxants, Subject name: Anaesthesia
A 25 year old overweight female was given fentanyl-pancuronium anesthesia for surgery. After surgery and extubation she was observed to have limited movement of the upper body and chest wall in the recovery room. She was Conscious and ale but voluntary respiratory effo has limited. Her blood pressure and hea rate were normal. The likely diagnosis is 
Select and explain. 
A. incomplete reversal of pancuronium, B. Pulmonary embolism, C. Fentanyl induced chest wall rigidity, D. Respiratory depression
A: incomplete reversal of pancuronium
Answer: A: incomplete reversal of pancuronium 
Explanation: Difficult in reversal than other intermediate agents.causes restricted movements to chest wall and upper body