CREATE TABLE table_50483 ("Year" FLOAT, "Competition" CLOB, "Venue" CLOB, "Position" CLOB, "Notes" CLOB)

What competition did Lineth Chepkurui place 5th?
SELECT "Competition" FROM table_50483 WHERE "Position" = '5th'
SELECT "Competition" FROM "table_50483" WHERE "Position" = '5th'