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_27757 ( "Stage" real, "Winner" text, "General classification" text, "Points classification" text, "Mountains classification" text, "Combination Classification" text, "Team classification" text )

### Question ###
Who was awarded mountains classifications when Mikel Nieve was the winner?

### Accurate SQL ###

SELECT "Mountains classification" FROM table_27757 WHERE "Winner" = 'Mikel Nieve'