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': 'Which of the waxes are derived from the lignite: \nSelect and explain. \nA. Paraffin wax, B. Inlay wax, C. Microcrystalline wax, D. Montan wax', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]