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
Which of the following is not true about non-depolarizing muscle relaxant? 
Select and explain. 
A. Mg2+ predisposes the block, B. Ca2+ antagonizes the block, C. Metabolised by pseudocholinesterase, D. Competitive inhibitor of acetylcholine
C: Metabolised by pseudocholinesterase
Answer: C: Metabolised by pseudocholinesterase 
Explanation: Among non-depolarizing blockers only mivacurium is metabolized by pseudocholinesterase. Block is potentiated by Mg2+ and Ca2+ increases the release of acetylcholine from nerve endings; thus paially antagonizes the block.