This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Depolarising Neuromuscular Blocking Agents, Subject name: Anaesthesia
Suxamethonium is available as a clear, colourless aqueous solution. The shelf-life of suxamethonium is: 
Select and explain. 
A. 6 months, B. 1 year, C. 2 years, D. 3 years
C: 2 years
Answer: C: 2 years 
Explanation: Ans. c. 2 years (Ref: Lees Synopsis on Anesthesia 13th/183)'Succinylcholine has a shelf life of around 18 months, generally stored at 20-40 C and can be stored upto 2 years.'- Lees Synopsis on Anesthesia 13th/183