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: Pathology
[{'content': 'Striae of Retzius are prominent in which of the following zones of enamel caries: \nSelect and explain. \nA. Translucent zone., B. Dark zone., C. Body of the lesion., D. Surface zone.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Body of the lesion\n\nBetween unaffected surface and dark zone\nArea of greatest demineralization\nPore volume – 5% in periphery and 25% in center\nQuinoline inhibition – body appears transparent\nWater inhibition – Positive birefringence compared to sound enamel\nStriae of Retzius - prominent', 'role': 'assistant'}]