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_18733814_2 (general_classification VARCHAR, points_classification VARCHAR, young_rider_classification VARCHAR)

### Question ###
When thomas löfkvist is the  young rider classification and alessandro petacchi is the points classification who are the general classifications? 

### Accurate SQL ###

SELECT general_classification FROM table_18733814_2 WHERE points_classification = "Alessandro Petacchi" AND young_rider_classification = "Thomas Löfkvist"