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.

Passage: Downtown San Diego is the central business district of San Diego, though the city is filled with business districts. These include Carmel Valley, Del Mar Heights, Mission Valley, Rancho Bernardo, Sorrento Mesa, and University City. Most of these districts are located in Northern San Diego and some within North County regions.
What is the central business district of downtown San Diego?

Passage: When Estonia was invaded and occupied by the Soviet Union in World War II, the status of the Estonian language changed to the first of two official languages (Russian being the other one). As with Latvia many immigrants entered Estonia under Soviet encouragement. In the second half of the 1970s, the pressure of bilingualism (for Estonians) intensified, resulting in widespread knowledge of Russian throughout the country. The Russian language was termed as 'the language of friendship of nations' and was taught to Estonian children, sometimes as early as in kindergarten. Although teaching Estonian to non-Estonians in schools was compulsory, in practice learning the language was often considered unnecessary.
What country did not occupy Estonia?

Passage: Other mentionable newspapers are the tabloid Informante owned by TrustCo, the weekly Windhoek Observer, the weekly Namibia Economist, as well as the regional Namib Times. Current affairs magazines include Insight Namibia, Vision2030 Focus magazine[citation needed] and Prime FOCUS. Sister Namibia Magazine stands out as the longest running NGO magazine in Namibia, while Namibia Sport is the only national sport magazine. Furthermore, the print market is complemented with party publications, student newspapers and PR publications.
Who owns the Windhoek Observer?