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': 'Interfacial surface tension does not act as a retentive factor in lower complete denture due to lack of \nSelect and explain. \nA. Liquid-Liquid interface, B. Liquid-air interface, C. Air-air interface, D. Liquid-gel interface', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]