What's the mountains classification of Stage 7 when Kim Kirchen was the general classification?
CREATE TABLE table_name_82 (
    mountains_classification VARCHAR,
    general_classification VARCHAR,
    stage VARCHAR
)
SELECT mountains_classification FROM table_name_82 WHERE general_classification = "kim kirchen" AND stage = "7"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What's the mountains classification of Stage 7 when Kim Kirchen was the general classification? ### Input: CREATE TABLE table_name_82 (
    mountains_classification VARCHAR,
    general_classification VARCHAR,
    stage VARCHAR
) ### Response: SELECT mountains_classification FROM table_name_82 WHERE general_classification = "kim kirchen" AND stage = "7"