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_28530 ( "Stage" real, "Winner" text, "General classification" text, "Points Classification" text, "Mountains Classification" text, "Sprints Classification" text, "Team Classification" text )

### Question ###
Who led sprints classification when Chris Horner led general classification?

### Accurate SQL ###

SELECT "Sprints Classification" FROM table_28530 WHERE "General classification" = 'Chris Horner'