What is th US A.C. in 1985 with a US hot 100 of 57?
CREATE TABLE "singles" (
  "year" real,
  "song" text,
  "canada_singles" text,
  "us_hot_100" text,
  "us_a_c" text
);
SELECT "us_a_c" FROM "singles" WHERE "year"=1985 AND "us_hot_100"='57';