What is the capital (endonym) where Douglas is the Capital (exonym)?
CREATE TABLE table_15918 (
    "Country ( exonym )" text,
    "Capital ( exonym )" text,
    "Country ( endonym )" text,
    "Capital ( endonym )" text,
    "Official or native language(s) (alphabet/script)" text
)
SELECT "Capital ( endonym )" FROM table_15918 WHERE "Capital ( exonym )" = 'Douglas'
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 capital (endonym) where Douglas is the Capital (exonym)? ### Input: CREATE TABLE table_15918 (
    "Country ( exonym )" text,
    "Capital ( exonym )" text,
    "Country ( endonym )" text,
    "Capital ( endonym )" text,
    "Official or native language(s) (alphabet/script)" text
) ### Response: SELECT "Capital ( endonym )" FROM table_15918 WHERE "Capital ( exonym )" = 'Douglas'