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': 'When the modified ridge lap pontic is further reduced, they are known as: \nSelect and explain. \nA. Lap facings., B. Modified ridge lap facing., C. Concave lap facing., D. None.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]