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
Interfacial surface tension does not act as a retentive factor in lower complete denture due to lack of 
Select and explain. 
A. Liquid-Liquid interface, B. Liquid-air interface, C. Air-air interface, D. Liquid-gel interface
B: Liquid-air interface
Answer: B: Liquid-air interface 
Explanation: None