This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Muscle Relaxant, Subject name: Anaesthesia
Shortest acting muscle relaxant is 
Select and explain. 
A. Succinylcholine, B. Vecuronium, C. Pancuronium, D. Atracurium
A: Succinylcholine
Answer: A: Succinylcholine 
Explanation: Ans) aSuccinylcholine is the only available depolarizing neuromuscular blocker. It is characterized by rapid onset of effect and ultrashort duration of ac-tion because of its rapid hydrolysis by butyryl cholinesterase.Classification of nondepolarizing neuromuscular blockers according to duration of action (time to T1 = 25% of control) after twice the ED95Class of BlockerLong-Acting (>50 min)Intermediate- Acting (20-50 min)Short-Acting (15-12 min)Ultrashort- acting (<10-12min)Steroidal compoundPancuronium pipecuroniumVecuronium Rocuronium Benzylisoquinolinium compoundsd-Tubocurarine Metocurine DoxacuriumAtracurium CisatrucuriumMivacurium Others Asymmetrical mixed-onium chlorofumarates GantacuriumPhenolic etherGallamine Diallyl derivative of toxiferineAlcuromum