Which opponent's march was 31?
CREATE TABLE table_78372 (
    "Game" real,
    "March" real,
    "Opponent" text,
    "Score" text,
    "Decision" text,
    "Record" text
)
SELECT "Opponent" FROM table_78372 WHERE "March" = '31'
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 opponent's march was 31? ### Input: CREATE TABLE table_78372 (
    "Game" real,
    "March" real,
    "Opponent" text,
    "Score" text,
    "Decision" text,
    "Record" text
) ### Response: SELECT "Opponent" FROM table_78372 WHERE "March" = '31'