CREATE TABLE table_name_5 (stage VARCHAR2, mountains_classification VARCHAR2, winner VARCHAR2)

Which stage has a mountains classification of Mariano Piccoli and was won by Giuseppe Citterio?
SELECT stage FROM table_name_5 WHERE mountains_classification = "mariano piccoli" AND winner = "giuseppe citterio"
SELECT "stage" FROM "table_name_5" WHERE "giuseppe citterio" = "winner" AND "mariano piccoli" = "mountains_classification"