what is the diameter (km) of feature of latitude 40.5s
CREATE TABLE table_16799784_7 (
    diameter__km_ VARCHAR,
    latitude VARCHAR
)
SELECT diameter__km_ FROM table_16799784_7 WHERE latitude = "40.5S"
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 is the diameter (km) of feature of latitude 40.5s ### Input: CREATE TABLE table_16799784_7 (
    diameter__km_ VARCHAR,
    latitude VARCHAR
) ### Response: SELECT diameter__km_ FROM table_16799784_7 WHERE latitude = "40.5S"