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: Oxygen was discovered independently by Carl Wilhelm Scheele, in Uppsala, in 1773 or earlier, and Joseph Priestley in Wiltshire, in 1774, but Priestley is often given priority because his work was published first. The name oxygen was coined in 1777 by Antoine Lavoisier, whose experiments with oxygen helped to discredit the then-popular phlogiston theory of combustion and corrosion. Its name derives from the Greek roots ὀξύς oxys, "acid", literally "sharp", referring to the sour taste of acids and -γενής -genes, "producer", literally "begetter", because at the time of naming, it was mistakenly thought that all acids required oxygen in their composition. Common uses of oxygen includes the production cycle of steel, plastics and textiles, brazing, welding and cutting of steels and other metals, rocket propellant, in oxygen therapy and life support systems in aircraft, submarines, spaceflight and diving.

Ex Output:
When did Carl Priestly discover oxygen?


Ex Input:
Passage: Like aluminium, copper is 100% recyclable without any loss of quality, regardless of whether it is in a raw state or contained in a manufactured product. In volume, copper is the third most recycled metal after iron and aluminium. It is estimated that 80% of the copper ever mined is still in use today. According to the International Resource Panel's Metal Stocks in Society report, the global per capita stock of copper in use in society is 35–55 kg. Much of this is in more-developed countries (140–300 kg per capita) rather than less-developed countries (30–40 kg per capita).

Ex Output:
What percent of copper is indestructible?


Ex Input:
Passage: In 1945, the British entrepreneur J. Arthur Rank, hoping to expand his American presence, bought into a four-way merger with Universal, the independent company International Pictures, and producer Kenneth Young. The new combine, United World Pictures, was a failure and was dissolved within one year. Rank and International remained interested in Universal, however, culminating in the studio's reorganization as Universal-International. William Goetz, a founder of International, was made head of production at the renamed Universal-International Pictures Inc., which also served as an import-export subsidiary, and copyright holder for the production arm's films. Goetz, a son-in-law of Louis B. Mayer decided to bring "prestige" to the new company. He stopped the studio's low-budget production of B movies, serials and curtailed Universal's horror and "Arabian Nights" cycles. Distribution and copyright control remained under the name of Universal Pictures Company Inc.

Ex Output:

Who bought into a four-way merger with Universal in 1954?