This task is about writing a correct answer for the reading comprehension task. Based on the information provided in a given passage, you should identify the shortest continuous text span from the passage that serves as an answer to the given question. Avoid answers that are incorrect or provides incomplete justification for the question.

Example Input: Passage: Nanjing borders Yangzhou to the northeast, one town downstream when following the north bank of the Yangtze, Zhenjiang to the east, one town downstream when following the south bank of the Yangtze, and Changzhou to the southeast. On its western boundary is Anhui province, where Nanjing borders five prefecture-level cities, Chuzhou to the northwest, Wuhu, Chaohu and Maanshan to the west and Xuancheng to the southwest. Question: What city is northeast of Nanjing?
Example Output: Yangzhou

Example Input: Passage: In the original city plan, the interstate buses should also stop at the Central Station. Because of the growth of Brasília (and corresponding growth in the bus fleet), today the interstate buses leave from the older interstate station (called Rodoferroviária), located at the western end of the Eixo Monumental. The Central Bus Station also contains a main metro station. A new bus station was opened in July 2010. It is on Saída Sul (South Exit) near Parkshopping Mall and with its metro station, and it's also an inter-state bus station, used only to leave the Federal District. Question: Where is the older interstate bus station?
Example Output: the western end of the Eixo Monumental

Example Input: Passage: Bewick then describes an experiment which succeeded in keeping swallows alive in Britain for several years, where they remained warm and dry through the winters. He concludes: Question: How long did the birds stay alive?
Example Output:
several years