Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_5 (stage VARCHAR, mountains_classification VARCHAR, winner VARCHAR)

### Question ###
Which stage has a mountains classification of Mariano Piccoli and was won by Giuseppe Citterio?

### Accurate SQL ###

SELECT stage FROM table_name_5 WHERE mountains_classification = "mariano piccoli" AND winner = "giuseppe citterio"