What were the names of the mixed doubles pair for the year that Ralph Nichols played in the men's singles match?
CREATE TABLE table_67374 (
    "Year" text,
    "Men's singles" text,
    "Men's doubles" text,
    "Women's doubles" text,
    "Mixed doubles" text
)
SELECT "Mixed doubles" FROM table_67374 WHERE "Men's singles" = 'ralph nichols'
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 were the names of the mixed doubles pair for the year that Ralph Nichols played in the men's singles match? ### Input: CREATE TABLE table_67374 (
    "Year" text,
    "Men's singles" text,
    "Men's doubles" text,
    "Women's doubles" text,
    "Mixed doubles" text
) ### Response: SELECT "Mixed doubles" FROM table_67374 WHERE "Men's singles" = 'ralph nichols'