Input: Article: In September 1828 Chopin, while still a student, visited Berlin with a family friend, zoologist Feliks Jarocki, enjoying operas directed by Gaspare Spontini and attending concerts by Carl Friedrich Zelter, Felix Mendelssohn and other celebrities. On an 1829 return trip to Berlin, he was a guest of Prince Antoni Radziwi, governor of the Grand Duchy of Posenhimself an accomplished composer and aspiring cellist. For the prince and his pianist daughter Wanda, he composed his Introduction and Polonaise brillante in C major for cello and piano, Op. 3.

Now answer this question: With whom did Chopin go to Berlin?

Output: Feliks Jarocki

Input: Article: Domestically, Barcelona has won 23 La Liga, 27 Copa del Rey, 11 Supercopa de Espana, 3 Copa Eva Duarte and 2 Copa de la Liga trophies, as well as being the record holder for the latter four competitions. In international club football, Barcelona has won five UEFA Champions League titles, a record four UEFA Cup Winners' Cup, a shared record five UEFA Super Cup, a record three Inter-Cities Fairs Cup and a record three FIFA Club World Cup trophies. Barcelona was ranked first in the IFFHS Club World Ranking for 1997, 2009, 2011, 2012 and 2015 and currently occupies the second position on the UEFA club rankings. The club has a long-standing rivalry with Real Madrid; matches between the two teams are referred to as El Clasico.

Now answer this question: How many UEFA Cup Winners' Cup wins does Barcelona have?

Output: four

Input: Article: Meanwhile, the Industrial Revolution laid open the door for mass production and consumption. Aesthetics became a criterion for the middle class as ornamented products, once within the province of expensive craftsmanship, became cheaper under machine production.

Now answer this question: What became cheap enough for the middle class to buy?

Output:
ornamented products