Problem: MP3:

The song "Tom's Diner" by Suzanne Vega was the first song used by Karlheinz Brandenburg to develop the MP3. Brandenburg adopted the song for testing purposes, listening to it again and again each time refining the scheme, making sure it did not adversely affect the subtlety of Vega's voice.

Who adjusted the song?
---
A: Karlheinz Brandenburg

Problem: Biodiversity:

The history of biodiversity during the Phanerozoic (the last 540 million years), starts with rapid growth during the Cambrian explosiona period during which nearly every phylum of multicellular organisms first appeared. Over the next 400 million years or so, invertebrate diversity showed little overall trend, and vertebrate diversity shows an overall exponential trend. This dramatic rise in diversity was marked by periodic, massive losses of diversity classified as mass extinction events. A significant loss occurred when rainforests collapsed in the carboniferous. The worst was the Permian-Triassic extinction event, 251 million years ago. Vertebrates took 30 million years to recover from this event.

In which era, did the first phylum of multicellular organisms appear?
---
A: the Cambrian explosion

Problem: FA Cup:

The competition is open to any eligible club down to Levels 10 of the English football league system - all 92 professional clubs in the Premier League and Football League (Levels 1 to 4), and several hundred "non-league" teams in Steps 1 to 6 of the National League System (Levels 5 to 10). A record 763 clubs competed in 201112. The tournament consists of 12 randomly drawn rounds followed by the semi-finals and the final. Entrants are not seeded, although a system of byes based on league level ensures higher ranked teams enter in later rounds - the minimum number of games needed to win the competition ranges from six to fourteen.

How many rounds in the tournament?
---
A: 12

Problem: Strasbourg:

The German Renaissance has bequeathed the city some noteworthy buildings (especially the current Chambre de commerce et d'industrie, former town hall, on Place Gutenberg), as did the French Baroque and Classicism with several hotels particuliers (i.e. palaces), among which the Palais Rohan (1742, now housing three museums) is the most spectacular. Other buildings of its kind are the "Hotel de Hanau" (1736, now the city hall), the Hotel de Klinglin (1736, now residence of the prefet), the Hotel des Deux-Ponts (1755, now residence of the military governor), the Hotel d'Andlau-Klinglin (1725, now seat of the administration of the Port autonome de Strasbourg) etc. The largest baroque building of Strasbourg though is the 150 m (490 ft) long 1720s main building of the Hopital civil. As for French Neo-classicism, it is the Opera House on Place Broglie that most prestigiously represents this style.

How tall is the Chambre de commerce et d'industrie?
---
A:
unanswerable