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.

Ex Input:
Passage: Goodluck Jonathan served as Nigeria's president till 16 April 2011, when a new presidential election in Nigeria was conducted. Jonathan of the PDP was declared the winner on 19 April 2011, having won the election with a total of 22,495,187 of the 39,469,484 votes cast, to stand ahead of Muhammadu Buhari from the main opposition party, the Congress for Progressive Change (CPC), which won 12,214,853 of the total votes cast. The international media reported the elections as having run smoothly with relatively little violence or voter fraud, in contrast to previous elections. Question: What was the main opposition political party in 2011?

Ex Output:
Congress for Progressive Change

Ex Input:
Passage: The site where the Saint Petersburg Passage sprawls had been devoted to trade since the city's foundation in the early 18th century. It had been occupied by various shops and warehouses (Maly Gostiny Dvor, Schukin Dvor, Apraksin Dvor) until 1846, when Count Essen-Stenbock-Fermor acquired the grounds to build an elite shopping mall for the Russian nobility and wealthy bourgeoisie. Stenbock-Fermor conceived of the Passage as more than a mere shopping mall, but also as a cultural and social centre for the people of St Petersburg. The edifice contained coffee-houses, confectioneries, panorama installations, an anatomical museum, a wax museum, and even a small zoo, described by Dostoyevsky in his extravaganza "Crocodile, or Passage through the Passage". The concert hall became renowned as a setting for literary readings attended by the likes of Dostoevsky and Turgenev. Parenthetically, the Passage premises have long been associated with the entertainment industry and still remains home to the Komissarzhevskaya Theatre. Question: What famous author described parts of the mall in his books?

Ex Output:
Dostoyevsky

Ex Input:
Passage: The German rocket center in Peenemunde was located in the eastern part of Germany, which became the Soviet zone of occupation. On Stalin's orders, the Soviet Union sent its best rocket engineers to this region to see what they could salvage for future weapons systems. The Soviet rocket engineers were led by Sergei Korolev. He had been involved in space clubs and early Soviet rocket design in the 1930s, but was arrested in 1938 during Joseph Stalin's Great Purge and imprisoned for six years in Siberia. After the war, he became the USSR's chief rocket and spacecraft engineer, essentially the Soviet counterpart to von Braun. His identity was kept a state secret throughout the Cold War, and he was identified publicly only as "the Chief Designer." In the West, his name was only officially revealed when he died in 1966. Question: Where was Sergei Korolev imprisoned for six years?

Ex Output:
Siberia