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_30585 ( "Stage" real, "Winner" text, "General classification" text, "Points classification" text, "Mountains classification" text, "Young rider classification" text )

### Question ###
When Alberto Contador Kanstantsin Sivtsov was the general classification and Alessandro Petacchi was the points classification at the same time while Mark Cavendish is the winner, who was the mountain classification?

### Accurate SQL ###

SELECT "Mountains classification" FROM table_30585 WHERE "General classification" = 'Alberto Contador Kanstantsin Sivtsov' AND "Points classification" = 'Alessandro Petacchi' AND "Winner" = 'Mark Cavendish'