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 formula defining the HDI is promulgated by the United Nations Development Programme (UNDP). In general, to transform a raw variable, say , into a unit-free index between 0 and 1 (which allows different indices to be added together), the following formula is used:

SOLUTION:  What entity makes the defining formula for the HDMI well-known?

PROBLEM: Passage: In many parts of the world football evokes great passions and plays an important role in the life of individual fans, local communities, and even nations. R. Kapuscinski says that Europeans who are polite, modest, or humble fall easily into rage when playing or watching football games. The Côte d'Ivoire national football team helped secure a truce to the nation's civil war in 2006 and it helped further reduce tensions between government and rebel forces in 2007 by playing a match in the rebel capital of Bouaké, an occasion that brought both armies together peacefully for the first time. By contrast, football is widely considered to have been the final proximate cause for the Football War in June 1969 between El Salvador and Honduras. The sport also exacerbated tensions at the beginning of the Yugoslav Wars of the 1990s, when a match between Dinamo Zagreb and Red Star Belgrade degenerated into rioting in May 1990.

SOLUTION: Which team helped remove a truce during a civil war in 2006?

PROBLEM: Passage: Everton also have links with Chilean team Everton de Viña del Mar who were named after the English club. On 4 August 2010, the two Evertons played each other in a friendly named the Copa Hermandad at Goodison Park to mark the centenary of the Chilean team, an occasion organised by The Ruleteros Society, a society founded to promote connections between the two clubs. Other Evertons exist in Rosario in Colonia Department, Uruguay, La Plata, and Río Cuarto in Argentina, Elk Grove, California in the United States, and in Cork, Ireland.

SOLUTION:
On what date was Everton's California team established?