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 mean denture bearing area in the edentulous  mandible is approximately \nSelect and explain. \nA. 12.25 cm2 (14 cm2), B. 16.25 cm2, C. 18.12 cm2, D. 20.25 cm2', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]