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': 'What is the effect of soft tissue liner under the denture on the residual ridge? \nSelect and explain. \nA. Increases pressure threshold for ridge, B. Decreases pressure threshold for ridge, C. Does not depend on it, D. Depends on basal tissue', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Soft tissue liners increase the capacity of stress or load distribution throughout the ridge.', 'role': 'assistant'}]