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': 'Finn classified habits as: \nSelect and explain. \nA. Compulsive and non-compulsive, B. Primary and secondary, C. Useful and harmful habits, D. Both 1 and 2', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]