This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuromuscular Blocker, Subject name: Anaesthesia
85 yr old man with carcinoma bronchus is given general anesthesia for an emergency laparotomy, post operatively neuromuscular monitoring shows delayed recovery; most probable cause is 
Select and explain. 
A. Intracerebral bleed, B. Myasthenic syndrome, C. Ventilation perfusion mismatch, D. Blood loss
B: Myasthenic syndrome
Answer: B: Myasthenic syndrome 
Explanation: There is association of myasthenic syndrome with carcinoma bronchus . Delayed recovery is seen with neuromuscular blocker in myasthenic syndrome.