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': 'Kennedy class II condition derives its \nSelect and explain. \nA. Primary support from the tissue underlying the base and secondary support from the abutment teeth., B. Primary support from the abutment teeth., C. Primary support from the tissue underlying the base., D. Primary support from the abutment teeth and secondary support from the tissue underlying the base.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]