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: In 1872, Russian Alexander Lodygin invented an incandescent light bulb and obtained a Russian patent in 1874. He used as a burner two carbon rods of diminished section in a glass receiver, hermetically sealed, and filled with nitrogen, electrically arranged so that the current could be passed to the second carbon when the first had been consumed. Later he lived in the USA, changed his name to Alexander de Lodyguine and applied and obtained patents for incandescent lamps having chromium, iridium, rhodium, ruthenium, osmium, molybdenum and tungsten filaments, and a bulb using a molybdenum filament was demonstrated at the world fair of 1900 in Paris.

SOLUTION: Who did not patent an incandescent light bulb in 1872?

PROBLEM: Passage: As heirs of the Dominican priory of Poissy in France, the Dartford sisters were also heirs to a tradition of profound learning and piety. Sections of translations of spiritual writings in Dartford's library, such as Suso's Little Book of Eternal Wisdom and Laurent du Bois' Somme le Roi, show that the "ghoostli" link to Europe was not lost in the crossing of the Channel. It survived in the minds of the nuns. Also, the nuns shared a unique identity with Poissy as a religious house founded by a royal house. The English nuns were proud of this heritage, and aware that many of them shared in England's great history as members of the noble class, as seen in the next chapter.

SOLUTION: What priory were the Dartford sisters not heirs to?

PROBLEM: Passage: Pope John XXIII offered to mediate between US President John F. Kennedy and Nikita Khrushchev during the Cuban Missile Crisis in October 1962. Both men applauded the pope for his deep commitment to peace. Khrushchev would later send a message via Norman Cousins and the letter expressed his best wishes for the pontiff's ailing health. John XXIII personally typed and sent a message back to him, thanking him for his letter. Cousins, meanwhile, travelled to New York City and ensured that John would become Time magazine's 'Man of the Year'. John XXIII became the first Pope to receive the title, followed by John Paul II in 1994 and Francis in 2013.

SOLUTION:
Who did Pope John Paul II offer to mediate between during the Cuban Missile Crisis?