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': 'Earliest Ischaemic feature after reduction of Supra? condylar fracture is \nSelect and explain. \nA. Coldness, B. Pain, C. Swelling, D. Tingling', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Pain', 'role': 'assistant'}]