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
True about non-depolarizing muscle relaxants – a) Competitive inhibitor of acetylcholineb) Metabolised by pseudocholinesterasec) Mg2+ predisposes the blockd) Ca2+ antagonizes the blocke) Hypothermia prolongs the block 
Select and explain. 
A. bce, B. acde, C. abcd, D. abde
B: acde
Answer: B: acde 
Explanation: Non-depolarizing blockers act as competitive antagonists of Ach on Nm receptor at myoneural junction.
Magnesium and hypothermia potentiate the block whereas calcium antagonizes the block.