CREATE TABLE table_63823 ("Rank" FLOAT, "Lane" FLOAT, "Athlete" TEXT, "Nationality" TEXT, "Time" FLOAT, "React" FLOAT)

Which Athlete has a Reaction of 0.248?
SELECT "Athlete" FROM table_63823 WHERE "React" = '0.248'
SELECT "Athlete" FROM "table_63823" WHERE "React" = '0.248'