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': 'A material which is a mixture of two different materials and its properties are \nSelect and explain. \nA. Composite, B. Complex material, C. Combined, D. Compound', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]