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
Debucain number refers to 
Select and explain. 
A. Ach cholinestrase activity derangement, B. Potency of muscle relaxants, C. Potency of general anaesthetics, D. None
A: Ach cholinestrase activity derangement
Answer: A: Ach cholinestrase activity derangement 
Explanation: DIBUCAINE NUMBER * The Dibucaine Number is a measure of the qualitative activity of Pseudo cholinesterase and is the percentage of inhibition of the enzyme by the local anesthetic Dibucaine. * It is used to differentiate individuals who have substitution mutations of the Butryl cholinesterase enzyme