CREATE TABLE table_60775 ("Date" TEXT, "Nationality / Opponent" TEXT, "Ground" TEXT, "Result" TEXT, "Competition" TEXT)

Name the Nationality / Opponent of the Competition of welsh rugby union challenge trophy and a Result of 38-29?
SELECT "Nationality / Opponent" FROM table_60775 WHERE "Competition" = 'welsh rugby union challenge trophy' AND "Result" = '38-29'
SELECT "Nationality / Opponent" FROM "table_60775" WHERE "Competition" = 'welsh rugby union challenge trophy' AND "Result" = '38-29'