In this task, you are given a question and a context passage. You have to answer the question based on the given passage.
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Question: Who ruled Bithynia before Bas?, Context: The Bithynians were a Thracian people living in northwest Anatolia. After Alexander's conquests the region of Bithynia came under the rule of the native king Bas, who defeated Calas, a general of Alexander the Great, and maintained the independence of Bithynia. His son, Zipoetes I of Bithynia maintained this autonomy against Lysimachus and Seleucus I, and assumed the title of king (basileus) in 297 BCE. His son and successor, Nicomedes I, founded Nicomedia, which soon rose to great prosperity, and during his long reign (c. 278 – c. 255 BCE), as well as those of his successors, the kingdom of Bithynia held a considerable place among the minor monarchies of Anatolia. Nicomedes also invited the Celtic Galatians into Anatolia as mercenaries, and they later turned on his son Prusias I, who defeated them in battle. Their last king, Nicomedes IV, was unable to maintain himself against Mithridates VI of Pontus, and, after being restored to his throne by the Roman Senate, he bequeathed his kingdom by will to the Roman republic (74 BCE).

Answer: Calas


Question: What happened in the 62nd year of the 18th century?, Context: In 1762, George III acquired Buckingham House and it was enlarged over the next 75 years. During the 18th century, London was dogged by crime, and the Bow Street Runners were established in 1750 as a professional police force. In total, more than 200 offences were punishable by death, including petty theft. Most children born in the city died before reaching their third birthday. The coffeehouse became a popular place to debate ideas, with growing literacy and the development of the printing press making news widely available; and Fleet Street became the centre of the British press.

Answer: George III acquired Buckingham House


Question: Which team is affliated with the person in charge of fixing the Levi's Stadium field for game day?, Context: Concerns were raised over whether Levi's Stadium's field was of a high enough quality to host a Super Bowl; during the inaugural season, the field had to be re-sodded multiple times due to various issues, and during a week 6 game earlier in the 2015 season, a portion of the turf collapsed under Baltimore Ravens kicker Justin Tucker, causing him to slip and miss a field goal, although the field has not had any major issues since. As is customary for Super Bowl games played at natural grass stadiums, the NFL re-sodded the field with a new playing surface; a hybrid Bermuda 419 turf. NFL and Atlanta Braves field director Ed Mangan stated that the field was in "great shape" for gameday. However, the turf showed problem throughout the game, with a number of players needing to change their cleats during the game and player slipping during plays all throughout the game.

Answer:
Atlanta Braves