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': 'Rate of Oxygen consumption by odontoblast is \nSelect and explain. \nA. 3.2+- 0.2 ml/min/100g, B. 4.2+- 0.2 ml/min/100g, C. 2.2+- 0.2 ml/min/100g, D. 3.5+- 0.2 ml/min/100g', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]