Which entrant has 49 points and a Mclaren M7A chassis?
CREATE TABLE "complete_formula_one_world_championship_" (
  "year" real,
  "entrant" text,
  "chassis" text,
  "engine" text,
  "tyres" text,
  "points" text
);
SELECT "entrant" FROM "complete_formula_one_world_championship_" WHERE "points"='49' AND "chassis"='mclaren m7a';