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
Which of the following characteristics of inlay wax is its major disadvantage? 
Select and explain. 
A. Flow, B. Rigidity, C. High thermal expansion, D. Low thermal conductivity
C: High thermal expansion
Answer: C: High thermal expansion 
Explanation: None