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': 'Resting rate of blood flow to the pulp \nSelect and explain. \nA. 15-16 ml/min/100g tissue, B. 15-60 ml/min/100g tissue, C. 50-70 ml/min/100g tissue, D. 60-80 ml/min/100g tissue', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]