Input: Article: The Roman Empire came to dominate the entire Mediterranean basin in a vast empire based on Roman law and Roman legions. It promoted trade, tolerance, and Greek culture. By 300 AD the Roman Empire was divided into the Western Roman Empire based in Rome, and the Eastern Roman Empire based in Constantinople. The attacks of the Germanic peoples of northern Europe led to the Fall of the Western Roman Empire in AD 476, a date which traditionally marks the end of the classical period and the start of the Middle Ages.

Now answer this question: What year is considered the transition between the classical period and the Middle Ages?

Output: AD 476

Input: Article: Early reports of Europeans reaching this area include those of the Venetian Alvise Cadamosto's voyage of 1455, the 14791480 voyage by Flemish-French trader Eustache de la Fosse, and Diogo Cao. In the 1480s this Portuguese explorer reached the Congo River and the lands of Bakongo, setting up the foundations of modern Angola, some 4200 km down the African coast from Guinea-Bissau.

Now answer this question: What river did Diogo Cao reach in the 1480's?

Output: Congo River

Input: Article: The Basilica of Saint Denis is generally cited as the first truly Gothic building, however the distinction is best reserved for the choir, of which the ambulatory remains intact. Noyon Cathedral, also in France, saw the earliest completion of a rebuilding of an entire cathedral in the new style from 1150 to 1231. While using all those features that came to be known as Gothic, including pointed arches, flying buttresses and ribbed vaulting, the builders continued to employ many of the features and much of the character of Romanesque architecture including round-headed arch throughout the building, varying the shape to pointed where it was functionally practical to do so.

Now answer this question: What is one of the features that have come to be considered as an important part of the Gothic style?

Output:
flying buttresses