What was the author/editor/source when the l.a. ranking was 1st?
CREATE TABLE table_23446 (
    "Index (Year)" text,
    "Author / Editor / Source" text,
    "Year of publication" text,
    "Countries sampled" real,
    "World Ranking (1)" text,
    "Ranking L.A. (2)" text
)
SELECT "Author / Editor / Source" FROM table_23446 WHERE "Ranking L.A. (2)" = '1st'
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 was the author/editor/source when the l.a. ranking was 1st? ### Input: CREATE TABLE table_23446 (
    "Index (Year)" text,
    "Author / Editor / Source" text,
    "Year of publication" text,
    "Countries sampled" real,
    "World Ranking (1)" text,
    "Ranking L.A. (2)" text
) ### Response: SELECT "Author / Editor / Source" FROM table_23446 WHERE "Ranking L.A. (2)" = '1st'