CREATE TABLE "complete_formula_one_world_championship_" (
  "year" real,
  "entrant" text,
  "chassis" text,
  "engine" text,
  "pts" real
);

Question: What entrant has osella fa1c chassis after 1981?
SQL: SELECT "entrant" FROM "complete_formula_one_world_championship_" WHERE "year">1981 AND "chassis"='osella fa1c';