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: Pathology
[{'content': 'In blood transfusion, blood group most impoant is \nSelect and explain. \nA. Kell, B. Lewis, C. Li, D. Lutheran', 'role': 'user'}, {'content': 'Answer: A \nExplanation: . Kell', 'role': 'assistant'}]