user: Question: Who led sprints classification when Chris Horner led general classification?
Columns: ['Stage', 'Winner', 'General classification', 'Points Classification', 'Mountains Classification', 'Sprints Classification', 'Team Classification']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Alejandro Valverde Óscar Freire', 'Alejandro Valverde Óscar Freire', 'Alejandro Valverde Óscar Freire', 'Gonzalo Rabuñal', 'Christian Meier', 'Team RadioShack']
SQL:

assistant: SELECT "Sprints Classification" FROM "Table" WHERE "General classification" = 'Chris Horner';