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': 'Emergency retentive force for the maxillary complete denture is \nSelect and explain. \nA. Deep palate, B. Soft palate, C. Posterior palatal seal, D. Base of the tongue', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]