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': 'The tissue stops should engage buccal and lingual slopes of residual ridge for \nSelect and explain. \nA. Stability, B. Support, C. Retention, D. Reciprocation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]