Name the national rank for medical university of south carolina
CREATE TABLE "universities_and_colleges_ranked_by_endo" (
  "state_rank" real,
  "national_rank" real,
  "institution" text,
  "location" text,
  "public_or_private" text,
  "endowment_funds" text,
  "percentage_change_yoy" text
);
SELECT "national_rank" FROM "universities_and_colleges_ranked_by_endo" WHERE "institution"='Medical University of South Carolina';