Problem: Please answer a question about the following article about Frédéric Chopin:
Back in Warsaw that year, Chopin heard Niccolò Paganini play the violin, and composed a set of variations, Souvenir de Paganini. It may have been this experience which encouraged him to commence writing his first Études, (1829–32), exploring the capacities of his own instrument. On 11 August, three weeks after completing his studies at the Warsaw Conservatory, he made his debut in Vienna. He gave two piano concerts and received many favourable reviews—in addition to some commenting (in Chopin's own words) that he was "too delicate for those accustomed to the piano-bashing of local artists". In one of these concerts, he premiered his Variations on Là ci darem la mano, Op. 2 (variations on an aria from Mozart's opera Don Giovanni) for piano and orchestra. He returned to Warsaw in September 1829, where he premiered his Piano Concerto No. 2 in F minor, Op. 21 on 17 March 1830.
Who did Chopin hear play violin in 1829 that prompted him to write a composisition?
A: Niccolò Paganini
Problem: Please answer a question about the following article about Daylight saving time:
After Germany led the way with starting DST (German: Sommerzeit) during World War I on 30 April 1916 together with its allies to alleviate hardships from wartime coal shortages and air raid blackouts, the political equation changed in other countries; the United Kingdom used DST first on 21 May 1916. US retailing and manufacturing interests led by Pittsburgh industrialist Robert Garland soon began lobbying for DST, but were opposed by railroads. The US's 1917 entry to the war overcame objections, and DST was established in 1918.
What industrialist from Pittsburgh campaigned strongly in favor of DST?
A: Robert Garland
Problem: Please answer a question about the following article about FA Cup:
The possibility of unlikely victories in the earlier rounds of the competition, where lower ranked teams beat higher placed opposition, known as "giant killings", is much anticipated by the public, and is considered an integral part of the tradition and prestige of the competition, alongside that gained by teams winning the competition. Almost every club in the League Pyramid has a fondly remembered giant-killing act in its history. It is considered particularly newsworthy when a top Premier League team suffers an upset defeat, or where the giant-killer is a non-league club, i.e. from outside the professional levels of The Football League.
Does giant killing happen often? 
A: Almost every club in the League Pyramid has a fondly remembered giant-killing act in its history
Problem: Please answer a question about the following article about John Kerry:
On April 22, 1971, Kerry appeared before a U.S. Senate committee hearing on proposals relating to ending the war. The day after this testimony, Kerry participated in a demonstration with thousands of other veterans in which he and other Vietnam War veterans threw their medals and service ribbons over a fence erected at the front steps of the United States Capitol building to dramatize their opposition to the war. Jack Smith, a Marine, read a statement explaining why the veterans were returning their military awards to the government. For more than two hours, almost 1000 angry veterans tossed their medals, ribbons, hats, jackets, and military papers over the fence. Each veteran gave his or her name, hometown, branch of service and a statement. Kerry threw some of his own decorations and awards as well as some given to him by other veterans to throw. As Kerry threw his decorations over the fence, his statement was: "I'm not doing this for any violent reasons, but for peace and justice, and to try and make this country wake up once and for all."
What did Kerry do on Apr 22, 1971?
A:
appeared before a U.S. Senate committee hearing