Question: Which city, Nanjing or Ningbo, is the capital city of Jiangsu province of People's Republic of China?
Sentence (from "Nanjing"): The inner area of Nanjing enclosed by the city wall is Nanjing City (南京城), with an area of 55 km, while the Nanjing Metropolitan Region includes surrounding cities and areas, covering over 60 thousand square kilometres, with a population of over 30 million.
Relevant evidence: No