Which event did he win with a method of submission (triangle choke) and a time of n/a?
CREATE TABLE table_7978 (
    "Res." text,
    "Record" text,
    "Opponent" text,
    "Method" text,
    "Event" text,
    "Round" real,
    "Time" text,
    "Location" text
)
SELECT "Event" FROM table_7978 WHERE "Res." = 'win' AND "Time" = 'n/a' AND "Method" = 'submission (triangle choke)'
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: Which event did he win with a method of submission (triangle choke) and a time of n/a? ### Input: CREATE TABLE table_7978 (
    "Res." text,
    "Record" text,
    "Opponent" text,
    "Method" text,
    "Event" text,
    "Round" real,
    "Time" text,
    "Location" text
) ### Response: SELECT "Event" FROM table_7978 WHERE "Res." = 'win' AND "Time" = 'n/a' AND "Method" = 'submission (triangle choke)'