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: The softness of copper partly explains its high electrical conductivity (59.6106 S/m) and thus also high thermal conductivity, which are the second highest (to silver) among pure metals at room temperature. This is because the resistivity to electron transport in metals at room temperature mostly originates from scattering of electrons on thermal vibrations of the lattice, which are relatively weak for a soft metal. The maximum permissible current density of copper in open air is approximately 3.1106 A/m2 of cross-sectional area, above which it begins to heat excessively. As with other metals, if copper is placed against another metal, galvanic corrosion will occur. Question: What is the explanation for copper's capacity for electrical conductivity?
Example Output: The softness

Example Input: Passage: The redevelopment of the city was planned by Sir Patrick Abercrombie in his 1943 Plan for Plymouth whilst simultaneously working on the reconstruction plan for London. Between 1951 and 1957 over 1000 homes were completed every year mostly using innovative prefabricated systems of just three main types; by 1964 over 20,000 new homes had been built transforming the dense overcrowded and unsanitary slums of the pre-war city into a low density, dispersed suburbia. Most of the city centre shops had been destroyed and those that remained were cleared to enable a zoned reconstruction according to his plan. In 1962 the modernist high rise of the Civic Centre was constructed, an architecturally significant example of mid twentieth century civic slab-and-tower set piece allowed to fall into disrepair by its owner Plymouth City Council but recently grade II listed by English Heritage to prevent its demolition. Question: In the period 1951-1957, how many new houses were constructed yearly in Plymouth?
Example Output: over 1000

Example Input: Passage: Montevideo has a very rich architectural heritage and an impressive number of writers, artists, and musicians. Uruguayan tango is a unique form of dance that originated in the neighbourhoods of Montevideo towards the end of the 1800s. Tango, candombe and murga are the three main styles of music in this city. The city is also the centre of the cinema of Uruguay, which includes commercial, documentary and experimental films. There are two movie theatre companies running seven cinemas, around ten independent ones and four art film cinemas in the city. The theatre of Uruguay is admired inside and outside Uruguayan borders. The Solis Theatre is the most prominent theatre in Uruguay and the oldest in South America. There are several notable theatrical companies and thousands of professional actors and amateurs. Montevideo playwrights produce dozens of works each year; of major note are Mauricio Rosencof, Ana Magnabosco and Ricardo Prieto. Question: How many movie theater companies are there in Montevideo?
Example Output:
two