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
[{'content': 'A 70 kg old athlete was posted for surgery, Patient was administered succinylcholine due to unavailability of vecuronium. It was administered in intermittent dosing [total 640 mgi. During recovery patient was not able to respire spontaneously & move limbs. What is the explanation- \nSelect and explain. \nA. Pseudocholinesterase deficiency increasing ,action of syccinylcholine, B. Phase 2 blockade produced by succinylcholine, C. Undiagnosed muscular dystrophy and muscular weakness, D. Muscular weakness due to fasciculation produced by succinylcholine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]