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 following characteristics of inlay wax is its major disadvantage? \nSelect and explain. \nA. Flow, B. Rigidity, C. High thermal expansion, D. Low thermal conductivity', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]