user: Question: What is the intergiro classification of stage 21?
Columns: ['Stage', 'Winner', 'General classification', 'Points classification', 'Mountains classification', 'Intergiro classification', 'Trofeo Fast Team']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Silvio Martinello', 'Silvio Martinello', 'Silvio Martinello', 'N/A', 'N/A', 'Scrigno-Blue Storm']
SQL:

assistant: SELECT "Intergiro classification" FROM "Table" WHERE "Stage" = 21.0;