Input: Read this: By 500 BC, the Persian Empire controlled the Greek city states in Asia Minor and had made territorial gains in the Balkans and Eastern Europe proper as well. Attempts by some of the Greek city-states of Asia Minor to overthrow Persian rule failed, and Persia invaded the states of mainland Greece in 492 BC, but was forced to withdraw after a defeat at the Battle of Marathon in 490 BC. A second invasion by the Persians followed in 480 BC. Despite a heroic resistance at Thermopylae by Spartans and other Greeks led by King Leonidas, and a simultaneous naval engagement at Artemisium,[page needed] Persian forces occupied Athens, which had been evacuated in time, as well as briefly overrunning half of Greece. Following decisive Greek victories in 480 and 479 BC at Salamis, Plataea, and Mycale, the Persians were forced to withdraw for a second time, marking their eventual withdrawal from all of their European territories. Led by Athens and Sparta, the Greek victories in the Greco-Persian Wars are considered a pivotal moment in world history, as the 50 years of peace that followed are known as Golden Age of Athens, the seminal period of ancient Greece that laid many of the foundations of Western civilization.
Question: In 500 BC, Greece was ruled over by who?

Output: Persian Empire


Input: Read this: In 2000, Madonna starred in the film The Next Best Thing, and contributed two songs to the film's soundtrack; "Time Stood Still" and a cover of Don McLean's 1971 song "American Pie". She released her eighth studio album, Music, in September 2000. It featured elements from the electronica-inspired Ray of Light era, and like its predecessor, received acclaim from critics. Collaborating with French producer Mirwais Ahmadzaï, Madonna commented: "I love to work with the weirdos that no one knows about—the people who have raw talent and who are making music unlike anyone else out there. Music is the future of sound." Stephen Thomas Erlewine from AllMusic felt that "Music blows by in a kaleidoscopic rush of color, technique, style and substance. It has so many depth and layers that it's easily as self-aware and earnest as Ray of Light." The album took the number-one position in more than 20 countries worldwide and sold four million copies in the first ten days. In the U.S., Music debuted at the top, and became her first number-one album in eleven years since Like a Prayer. It produced three singles: the Hot 100 number one "Music", "Don't Tell Me", and "What It Feels Like for a Girl". The music video of "What It Feels Like for a Girl" depicted Madonna committing acts of crime and vandalism, and was banned by MTV and VH1.
Question: What was Madonna's eighth album called?

Output: Music


Input: Read this: On 7 August 1998, al-Qaeda struck the U.S. embassies in Kenya and Tanzania, killing 224 people, including 12 Americans. In retaliation, U.S. President Bill Clinton launched Operation Infinite Reach, a bombing campaign in Sudan and Afghanistan against targets the U.S. asserted were associated with WIFJAJC, although others have questioned whether a pharmaceutical plant in Sudan was used as a chemical warfare plant. The plant produced much of the region's antimalarial drugs and around 50% of Sudan's pharmaceutical needs. The strikes failed to kill any leaders of WIFJAJC or the Taliban.
Question: Where was the pharmaceutical plant said to produce 12% of Sudan's pharmaceutical needs?

Output: unanswerable


Input: Read this: Most of Hume's followers have disagreed with his conclusion that belief in an external world is rationally unjustifiable, contending that Hume's own principles implicitly contained the rational justification for such a belief, that is, beyond being content to let the issue rest on human instinct, custom and habit. According to an extreme empiricist theory known as phenomenalism, anticipated by the arguments of both Hume and George Berkeley, a physical object is a kind of construction out of our experiences. Phenomenalism is the view that physical objects, properties, events (whatever is physical) are reducible to mental objects, properties, events. Ultimately, only mental objects, properties, events, exist — hence the closely related term subjective idealism. By the phenomenalistic line of thinking, to have a visual experience of a real physical thing is to have an experience of a certain kind of group of experiences. This type of set of experiences possesses a constancy and coherence that is lacking in the set of experiences of which hallucinations, for example, are a part. As John Stuart Mill put it in the mid-19th century, matter is the "permanent possibility of sensation". Mill's empiricism went a significant step beyond Hume in still another respect: in maintaining that induction is necessary for all meaningful knowledge including mathematics. As summarized by D.W. Hamlin:
Question: What did John Stuart Mill say matter is?

Output:
the "permanent possibility of sensation"