Input: Read this: Architects such as Mies van der Rohe, Philip Johnson and Marcel Breuer worked to create beauty based on the inherent qualities of building materials and modern construction techniques, trading traditional historic forms for simplified geometric forms, celebrating the new means and methods made possible by the Industrial Revolution, including steel-frame construction, which gave birth to high-rise superstructures. By mid-century, Modernism had morphed into the International Style, an aesthetic epitomized in many ways by the Twin Towers of New York's World Trade Center designed by Minoru Yamasaki.
Question: Who designed the Triplet Towers?

Output: unanswerable

QUES: The Cathedral of Brasilia in the capital of the Federative Republic of Brazil, is an expression of the architect Oscar Niemeyer. This concrete-framed hyperboloid structure, seems with its glass roof reaching up, open, to the heavens. On 31 May 1970, the Cathedral's structure was finished, and only the 70 m (229.66 ft) diameter of the circular area were visible. Niemeyer's project of Cathedral of Brasilia is based in the hyperboloid of revolution which sections are asymmetric. The hyperboloid structure itself is a result of 16 identical assembled concrete columns. These columns, having hyperbolic section and weighing 90 t, represent two hands moving upwards to heaven. The Cathedral was dedicated on 31 May 1970.

How much do the Cathedral of Brasilia's columns weigh?
What is the answer?
ANS: 90 t

QUES: Ben Goldacre has argued that regulators such as the Medicines and Healthcare products Regulatory Agency (MHRA) in the UK, or the Food and Drug Administration (FDA) in the United States advance the interests of the drug companies rather than the interests of the public due to revolving door exchange of employees between the regulator and the companies and friendships develop between regulator and company employees. He argues that regulators do not require that new drugs offer an improvement over what is already available, or even that they be particularly effective.
The business friendships between which parties have been praised?

ANS: unanswerable

DC commutating electric motors, if fitted with laminated pole pieces, become universal motors because they can also operate on AC; reversing the current in both stator and rotor does not reverse the motor. But the now-standard AC distribution frequencies of 50 and 60 Hz caused difficulties with inductive reactance and eddy current losses. Many railways chose low AC frequencies to overcome these problems. They must be converted from utility power by motor-generators or static inverters at the feeding substations or generated at dedicated traction powerstations.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): How can low frequencies be obtained?
Ah, so.. converted from utility power

Question: Athanasius's first problem lay with Meletius of Lycopolis and his followers, who had failed to abide by the First Council of Nicaea. That council also anathematized Arius. Accused of mistreating Arians and Meletians, Athanasius answered those charges at a gathering of bishops in Tyre, the First Synod of Tyre, in 335. There, Eusebius of Nicomedia and other supporters of Arius deposed Athanasius. On 6 November, both sides of the dispute met with Emperor Constantine I in Constantinople. At that meeting, the Arians claimed Athanasius would try to cut off essential Egyptian grain supplies to Constantinople. He was found guilty, and sent into exile to Augusta Treverorum in Gaul (now Trier in Germany).
Try to answer this question if possible: What exile is in modern day France?
Answer: unanswerable

Context and question: Tourism accounts for much of Uruguay's economy. Tourism in Montevideo is centered in the Ciudad Vieja area, which includes the city's oldest buildings, several museums, art galleries, and nightclubs, with Sarandi Street and the Mercado del Puerto being the most frequented venues of the old city. On the edge of Ciudad Vieja, Plaza Independencia is surrounded by many sights, including the Solis Theatre and the Palacio Salvo; the plaza also constitutes one end of 18 de Julio Avenue, the city's most important tourist destination outside of Ciudad Vieja. Apart from being a shopping street, the avenue is noted for its Art Deco buildings, three important public squares, the Gaucho Museum, the Palacio Municipal and many other sights. The avenue leads to the Obelisk of Montevideo; beyond that is Parque Batlle, which along with the Parque Prado is another important tourist destination. Along the coast, the Fortaleza del Cerro, the Rambla (the coastal avenue), 13 kilometres (8.1 mi) of sandy beaches, and Punta Gorda attract many tourists, as do the Barrio Sur and Palermo barrios.
What accounts for much of Uruguay's economy?
Answer:
Tourism