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': 'Structures resembling sample that is: \nSelect and explain. \nA. week old, B. Two week old, C. Three week old, D. Four week old', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]