This task is about reading the given passage and construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) its answer is a continuous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses same words or phrases given in the passage.

Input: Consider Input: The two largest metropolitan areas have subway systems: Lisbon Metro and Metro Sul do Tejo in the Lisbon Metropolitan Area and Porto Metro in the Porto Metropolitan Area, each with more than 35 km (22 mi) of lines. In Portugal, Lisbon tram services have been supplied by the Companhia de Carris de Ferro de Lisboa (Carris), for over a century. In Porto, a tram network, of which only a tourist line on the shores of the Douro remain, began construction on 12 September 1895 (a first for the Iberian Peninsula). All major cities and towns have their own local urban transport network, as well as taxi services.

Output: What are the two subway systems in Portugal?

Input: Consider Input: The elections of 2010 resulted in a victory for the military-backed Union Solidarity and Development Party. Various foreign observers questioned the fairness of the elections. One criticism of the election was that only government sanctioned political parties were allowed to contest in it and the popular National League for Democracy was declared illegal. However, immediately following the elections, the government ended the house arrest of the democracy advocate and leader of the National League for Democracy, Aung San Suu Kyi, and her ability to move freely around the country is considered an important test of the military's movement toward more openness. After unexpected reforms in 2011, NLD senior leaders have decided to register as a political party and to field candidates in future by-elections.

Output: What was the name of the winning unit in the 2010 elections in Burma ?

Input: Consider Input: The strategy behind the formation of the Warsaw Pact was driven by the desire of the Soviet Union to dominate Central and Eastern Europe. This policy was driven by ideological and geostrategic reasons. Ideologically, the Soviet Union arrogated the right to define socialism and communism and act as the leader of the global socialist movement. A corollary to this idea was the necessity of intervention if a country appeared to be violating core socialist ideas and Communist Party functions, which was explicitly stated in the Brezhnev Doctrine. Geostrategic principles also drove the Soviet Union to prevent invasion of its territory by Western European powers.
Output: Which ideologies did the Soviet Union aspire to lead around the globe?