Question: Which city, Suihua or Gaoyou, is a county-level city under the administration of Yangzhou, Jiangsu province, China, located in the Yangtze River Delta?
Sentence (from "Suihua"): It has 5,418,453 inhabitants at the 2010 census, of whom 877,114 lived in the built-up ("or metro") area made of Beilin District.
Relevant evidence: No