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': 'Which blood group is universal donor ? \nSelect and explain. \nA. A, B. B, C. 0, D. AB', 'role': 'user'}, {'content': "Answer: C \nExplanation: Answer- C. 0Blood group'O'- Universal donor", 'role': 'assistant'}]