TASK DEFINITION: This task is about creating an unanswerable question based on a given passage. Construct a question that looks relevant to the given context but is unanswerable. Following are a few suggestions about how to create unanswerable questions:
(i) create questions which require satisfying a constraint that is not mentioned in the passage
(ii) create questions which require information beyond what is provided in the passage in order to answer
(iii) replace an existing entity, number, date mentioned in the passage with other entity, number, date and use it in the question
(iv) create a question which is answerable from the passage and then replace one or two words by their antonyms or insert/remove negation words to make it unanswerable.
PROBLEM: Passage: The most precise timekeeping device of the ancient world was the water clock, or clepsydra, one of which was found in the tomb of Egyptian pharaoh Amenhotep I (15251504 BC). They could be used to measure the hours even at night, but required manual upkeep to replenish the flow of water. The Ancient Greeks and the people from Chaldea (southeastern Mesopotamia) regularly maintained timekeeping records as an essential part of their astronomical observations. Arab inventors and engineers in particular made improvements on the use of water clocks up to the Middle Ages. In the 11th century, Chinese inventors and engineers invented the first mechanical clocks driven by an escapement mechanism.

SOLUTION: What device was invented by the ancient Greeks?

PROBLEM: Passage: Henry VIII assumed direct royal control in 1539 and granted the abbey the status of a cathedral by charter in 1540, simultaneously issuing letters patent establishing the Diocese of Westminster. By granting the abbey cathedral status Henry VIII gained an excuse to spare it from the destruction or dissolution which he inflicted on most English abbeys during this period.

SOLUTION: When did Henry VII take direct royal control?

PROBLEM: Passage: Metrobus Transit is responsible for public transit in the region. Metrobus has a total of 19 routes, 53 buses and an annual ridership of 3,014,073. Destinations include the Avalon Mall, The Village Shopping Centre, Memorial University, Academy Canada, the College of the North Atlantic, the Marine Institute, the Confederation Building, downtown, Stavanger Drive Business Park, Kelsey Drive, Goulds, Kilbride, Shea Heights, the four hospitals in the city as well as other important areas in St. John's and Mount Pearl.

SOLUTION:
What transit has 53 routes?