CREATE TABLE table_42802 ("Office" TEXT, "Democratic ticket" TEXT, "Republican ticket" TEXT, "Prohibition ticket" TEXT, "Greenback ticket" TEXT)

Who was on the prohibition ticket when the Greenback ticket had Thomas Armstrong?
SELECT "Prohibition ticket" FROM table_42802 WHERE "Greenback ticket" = 'thomas armstrong'
SELECT "Prohibition ticket" FROM "table_42802" WHERE "Greenback ticket" = 'thomas armstrong'