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
After suxamethonium 50mg, apnea persists for one hour 
Select and explain. 
A. 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
B: Probab1y an atypical cholinesterase is present
Answer: B: Probab1y an atypical cholinesterase is present 
Explanation: Cholinesterase is a family of enzymes present in the central nervous system, particularly in  of this enzyme in any tissue most likely has no significance in terms of health.
Discriminates three phenotypes: Normal, intermediate, and atypical.