Input: Read this: The Byzantine Empire ruled the northern shores of the Sahara from the 5th to the 7th centuries. After the Muslim conquest of Arabia (Arabian peninsula) the Muslim conquest of North Africa began in the mid-7th to early 8th centuries, Islamic influence expanded rapidly on the Sahara. By the end of 641 all of Egypt was in Muslim hands. The trade across the desert intensified. A significant slave trade crossed the desert. It has been estimated that from the 10th to 19th centuries some 6,000 to 7,000 slaves were transported north each year.
Question: What is the estimated number of slaves that were transported each year?

Output: 6,000 to 7,000 slaves

Input: Read this: The London Fire Brigade is the statutory fire and rescue service for Greater London. It is run by the London Fire and Emergency Planning Authority and is the third largest fire service in the world. National Health Service ambulance services are provided by the London Ambulance Service (LAS) NHS Trust, the largest free-at-the-point-of-use emergency ambulance service in the world. The London Air Ambulance charity operates in conjunction with the LAS where required. Her Majesty's Coastguard and the Royal National Lifeboat Institution operate on the River Thames, which is under the jurisdiction of the Port of London Authority from Teddington Lock to the sea.
Question: Who oversees and manages the London Fire Brigade?

Output: London Fire and Emergency Planning Authority

Input: Read this: After the watershed events of Hurricane Andrew in 1992, the state of Florida began investing in economic development through the Office of Trade, Tourism, and Economic Development. Governor Jeb Bush realized that watershed events such as Andrew negatively impacted Florida's backbone industry of tourism severely. The office was directed to target Medical/Bio-Sciences among others. Three years later, The Scripps Research Institute (TSRI) announced it had chosen Florida for its newest expansion. In 2003, TSRI announced plans to establish a major science center in Palm Beach, a 364,000 square feet (33,800 m2) facility on 100 acres (40 ha), which TSRI planned to occupy in 2006.
Question: What did Govenor Bush Realize

Output: that watershed events such as Andrew negatively impacted Florida's backbone industry of tourism severely

Input: Read this: As many as five bands were on tour during the 1920s. The Jenkins Orphanage Band played in the inaugural parades of Presidents Theodore Roosevelt and William Taft and toured the USA and Europe. The band also played on Broadway for the play "Porgy" by DuBose and Dorothy Heyward, a stage version of their novel of the same title. The story was based in Charleston and featured the Gullah community. The Heywards insisted on hiring the real Jenkins Orphanage Band to portray themselves on stage. Only a few years later, DuBose Heyward collaborated with George and Ira Gershwin to turn his novel into the now famous opera, Porgy and Bess (so named so as to distinguish it from the play). George Gershwin and Heyward spent the summer of 1934 at Folly Beach outside of Charleston writing this "folk opera", as Gershwin called it. Porgy and Bess is considered the Great American Opera[citation needed] and is widely performed.
Question: What wasn't the name of the "folk opera" based on 'Porgy'?

Output:
unanswerable