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: Biochemistry
[{'content': 'The best technique to isolate DNA from enamel and dentin is \nSelect and explain. \nA. Cryogenic grinding, B. Crushing, C. Horizontal section, D. Conventional endodontic process', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]