CREATE TABLE table_203_437 (id DECIMAL, "year" DECIMAL, "laureate" TEXT, "relation" TEXT, "category" TEXT, "rationale" TEXT)

who is the only person that received a nobel peace prize ?
SELECT "laureate" FROM table_203_437 WHERE "category" = 'nobel peace prize'
SELECT "laureate" FROM "table_203_437" WHERE "category" = 'nobel peace prize'