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: Dental
[{'content': 'The oxygen consumption of normal gingiva is: \nSelect and explain. \nA. 1.6\t± 0.3, B. 0.9\t± 0.22, C. 2.7\t± 0.41, D. 1.9\t± 0.21', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]