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': 'What is the disadvantage of using composites as restorative material? \nSelect and explain. \nA. Increased thermal conductivity, B. Decreased wear resistance, C. Decreased thermal conductivity, D. none of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]