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Which of the following most logically completes the argument? Scientists have created a new blood test to identify early indicators of lung cancer. This test measures a specific protein, known as lung-specific antigen (LSA), which is produced in higher quantities when lung cancer is present. The LSA test can identify lung cancer at its earliest stages in individuals who show no symptoms, but a definitive diagnosis requires further testing due to a significant rate of false positives. Recently, however, the Health Advisory Board advised against LSA screening for individuals over 70. This demographic would likely not benefit, since __________.