Name the D 41 which has a D 43 of r 18
CREATE TABLE table_51877 (
    "D 41" text,
    "D 42" text,
    "D 43" text,
    "D 44" text,
    "D 45" text,
    "D 46" text,
    "R 54" text,
    "R 53" text,
    "R 52" text,
    "R 51" text
)
SELECT "D 41" FROM table_51877 WHERE "D 43" = 'r 18'
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: Name the D 41 which has a D 43 of r 18 ### Input: CREATE TABLE table_51877 (
    "D 41" text,
    "D 42" text,
    "D 43" text,
    "D 44" text,
    "D 45" text,
    "D 46" text,
    "R 54" text,
    "R 53" text,
    "R 52" text,
    "R 51" text
) ### Response: SELECT "D 41" FROM table_51877 WHERE "D 43" = 'r 18'