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': 'All are true about the striae of retzius except \nSelect and explain. \nA. Constitute the rest lines with in the enamel rods, B. Have high inorganic content, C. They are areas of increased porosity, D. Allow the movement of water and small ions', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]