CREATE TABLE table_42801 ("Office" TEXT, "Democratic ticket" TEXT, "Republican ticket" TEXT, "Prohibition ticket" TEXT, "Greenback ticket" TEXT)

Who was on the Prohibition ticket when Thomas Armstrong ran on the Greenback ticket?
SELECT "Prohibition ticket" FROM table_42801 WHERE "Greenback ticket" = 'thomas armstrong'
SELECT "Prohibition ticket" FROM "table_42801" WHERE "Greenback ticket" = 'thomas armstrong'