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
Function of wetting agents used in casting procedure is 
Select and explain. 
A. To felicitate wetting of ring liner, B. To felicitate mixing investment, C. To reduce contact angle of a liquid with wax surface, D. For better wax elimination
C: To reduce contact angle of a liquid with wax surface
Answer: C: To reduce contact angle of a liquid with wax surface 
Explanation: None