Question: America's Response Monument  in in front of what rebuilt building that is the sixth tallest in the world
Sentence (from "Zifeng Tower"): Zifeng Tower (Greenland Center-Zifeng Tower or Greenland Square Zifeng Tower, formerly Nanjing Greenland Financial Center) is a 450 m supertall skyscraper in Nanjing, Jiangsu province, China.
Relevant evidence: No