This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anaesthesia
[{'content': 'After suxamethonium 50mg, apnea persists for one hour \nSelect and explain. \nA. Treatment with cholnesterase is indicated, B. Probab1y an atypical cholinesterase is present, C. Treatment with stored blood is indicated, D. Apnea may be due to low serum potassium concentration', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Cholinesterase is a family of enzymes present in the central nervous system, particularly in \xa0of this enzyme in any tissue most likely has no significance in terms of health.\nDiscriminates three phenotypes: Normal, intermediate, and atypical.', 'role': 'assistant'}]