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: Surgery
[{'content': '22 Gauge iv cannula colour is \nSelect and explain. \nA. Green, B. Grey, C. Blue, D. Pink', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Orange : 14G\nGray : 16G\nGreen : 18G\nPink : 20G\nBlue : 22G\nYellow : 24G', 'role': 'assistant'}]