The candidate with Riding of st. john's south—mount pearl is what gender?
CREATE TABLE "7_seats" (
  "riding" text,
  "candidate_s_name" text,
  "gender" text,
  "residence" text,
  "occupation" text,
  "votes" real,
  "rank" text
);
SELECT "gender" FROM "7_seats" WHERE "riding"='st. john''s south—mount pearl';