user: Question: Name the points classification for stage of 18b
Columns: ['Stage', 'Winner', 'General classification', 'Points classification', 'Mountains classification', 'Team classification']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['P', 'Francesco Moser', 'Francesco Moser', 'Francesco Moser', 'N/A', 'Reynolds']
SQL:

assistant: SELECT "Points classification" FROM "Table" WHERE "Stage" = '18b';