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 shorten dental arch concept? \nSelect and explain. \nA. Patient perception of functional compromise as well as benefit by not replacing missing molars., B. Distal & labial migration of most posterior teeth by not replacing missing molars., C. Supraeruption of opposite arch teeth by not replacing missing molars, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Shorten dental arch:\n\nHealthy & stable dental arch/dentition in which posterior molar teeth are missing.\nWith stability and limited but sufficient masticatory ability, posterior missing teeth are not replaced.\nIt\xa0always shows compromise v/s benefit ratio by replacing/not replacing the missing teeth.', 'role': 'assistant'}]