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': 'In Enamel maturation during primary phase, initial Influx is abour: \nSelect and explain. \nA. 15-20% of total mineral content., B. 25-30% of total mineral content., C. 45-50% of total mineral content., D. 65-75% of total mineral content.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]