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_13637 ( "Stage" text, "Winner" text, "General classification" text, "Points classification" text, "Mountains classification" text, "Young rider classification" text )

### Question ###
What's the general classification of Ignatas Konovalovas when the mountains classification was Stefano Garzelli and points classification was Danilo Di Luca?

### Accurate SQL ###

SELECT "General classification" FROM table_13637 WHERE "Mountains classification" = 'stefano garzelli' AND "Points classification" = 'danilo di luca' AND "Winner" = 'ignatas konovalovas'