Who is the gagarin cup winner when avangard omsk is the gagarin cup finalist?
CREATE TABLE table_48890 (
    "Season" text,
    "Duration" text,
    "Gagarin Cup Winner" text,
    "Gagarin Cup finalist" text,
    "Continental Cup Winner" text,
    "Top scorer" text
)
SELECT "Gagarin Cup Winner" FROM table_48890 WHERE "Gagarin Cup finalist" = 'avangard omsk'
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: Who is the gagarin cup winner when avangard omsk is the gagarin cup finalist? ### Input: CREATE TABLE table_48890 (
    "Season" text,
    "Duration" text,
    "Gagarin Cup Winner" text,
    "Gagarin Cup finalist" text,
    "Continental Cup Winner" text,
    "Top scorer" text
) ### Response: SELECT "Gagarin Cup Winner" FROM table_48890 WHERE "Gagarin Cup finalist" = 'avangard omsk'