user: Question: Who was awarded mountains classifications when Mikel Nieve was the winner? 
Columns: ['Stage', 'Winner', 'General classification', 'Points classification', 'Mountains classification', 'Combination Classification', 'Team classification']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Team HTC-Columbia', 'Mark Cavendish', 'Mark Cavendish 1', 'not awarded', 'Mark Cavendish', 'Team HTC-Columbia']
SQL:

assistant: SELECT "Mountains classification" FROM "Table" WHERE "Winner" = 'Mikel Nieve';