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: CBC Television stations can be received in many United States communities along the Canadian border over-the-air and have a significant audience in those areas. Such a phenomenon can also take place within Great Lakes communities such as Ashtabula, Ohio, which received programming from the CBC's London, Ontario, transmitter, based upon prevailing atmospheric conditions over Lake Erie. As of September 2010 CBC shut down its analogue transmitter and decided not to replace it with a digital transmitter. As a result, there is now a giant hole in the coverage of CBC in South-Western Ontario. Both CBC - Toronto and CBC - Windsor are both over 100 miles from London, ON and out of range for even the largest antennas[citation needed].

SOLUTION: What location in the United States has the highest viewership of CBC programming?

PROBLEM: Passage: A number of other health conditions occur more frequently in those with asthma, including gastro-esophageal reflux disease (GERD), rhinosinusitis, and obstructive sleep apnea. Psychological disorders are also more common, with anxiety disorders occurring in between 16–52% and mood disorders in 14–41%. However, it is not known if asthma causes psychological problems or if psychological problems lead to asthma. Those with asthma, especially if it is poorly controlled, are at high risk for radiocontrast reactions.

SOLUTION: If GERD is poorly controlled, what does it make you at risk for?

PROBLEM: Passage: This has led to public discussions if Greece, Portugal, and even Italy would be better off leaving the eurozone to regain economical and financial stability if they would not implement reforms to strengthen their competitiveness as part of the eurozone in time. Greece had the greatest need for reforms but also most problems to implement those, so the Greek exit, also called "Grexit", has been widely discussed. Germany, as a large and financially stable state being in the focus to be asked to guarantee or repay other states debt, has never pushed those exits. Their position is to keep Greece within the eurozone, but not at any cost. If the worst comes to the worst, priority should be given to the euro's stability.

SOLUTION:
What term was forbidden when Greece left the eurozone?