CREATE TABLE "round_16" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "ground" text,
  "crowd" real,
  "date" text,
  "report" text
);

Question: Who was the away team when Carlton was the home team?
SQL: SELECT "away_team" FROM "round_16" WHERE "home_team"='Carlton';