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.

Ex Input:
Passage: Shell's primary business is the management of a vertically integrated oil company. The development of technical and commercial expertise in all stages of this vertical integration, from the initial search for oil (exploration) through its harvesting (production), transportation, refining and finally trading and marketing established the core competencies on which the company was founded. Similar competencies were required for natural gas, which has become one of the most important businesses in which Shell is involved, and which contributes a significant proportion of the company's profits. While the vertically integrated business model provided significant economies of scale and barriers to entry, each business now seeks to be a self-supporting unit without subsidies from other parts of the company.

Ex Output:
What is the least important business for Shell?


Ex Input:
Passage: The campus also houses several performing arts facilities. The de Jong Concert Hall seats 1282 people and is named for Gerrit de Jong Jr. The Pardoe Theatre is named for T. Earl and Kathryn Pardoe. Students use its stage in a variety of theatre experiments, as well as for Pardoe Series performances. It seats 500 people, and has quite a large stage with a proscenium opening of 19 by 55 feet (17 m). The Margetts Theatre was named for Philip N. Margetts, a prominent Utah theatre figure. A smaller, black box theater, it allows a variety of seating and staging formats. It seats 125, and measures 30 by 50 feet (15 m). The Nelke Theatre, named for one of BYU's first drama teachers, is used largely for instruction in experimental theater. It seats 280.

Ex Output:
What is named after T. Earl and Gerrit de Jong Jr.?


Ex Input:
Passage: San Diego was ranked as the 20th-safest city in America in 2013 by Business Insider. According to Forbes magazine, San Diego was the ninth-safest city in the top 10 list of safest cities in the U.S. in 2010. Like most major cities, San Diego had a declining crime rate from 1990 to 2000. Crime in San Diego increased in the early 2000s. In 2004, San Diego had the sixth lowest crime rate of any U.S. city with over half a million residents. From 2002 to 2006, the crime rate overall dropped 0.8%, though not evenly by category. While violent crime decreased 12.4% during this period, property crime increased 1.1%. Total property crimes per 100,000 people were lower than the national average in 2008.

Ex Output:

What happened to the crime rate in San Diego between 1990 and 2010?