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': 'Dead tracts in ground section appears as \nSelect and explain. \nA. Dentinal tubules, B. Coarse fibril bundles arranged at right angle to the dentinal surface, C. Black in transmitted light and white in reflected light, D. White in transmitted light and dark in reflected light', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]