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: Pharmacology
Shelf life of colourless, aqueous solution of suxamethonium is 
Select and explain. 
A. 6 months, B. 1 year, C. 2 yr, D. 3 yr
C: 2 yr
Answer: C: 2 yr 
Explanation: None