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.

Example Input: Passage: In 2013 and 2014, a Russian/Ukrainian hacking ring known as "Rescator" broke into Target Corporation computers in 2013, stealing roughly 40 million credit cards, and then Home Depot computers in 2014, stealing between 53 and 56 million credit card numbers. Warnings were delivered at both corporations, but ignored; physical security breaches using self checkout machines are believed to have played a large role. "The malware utilized is absolutely unsophisticated and uninteresting," says Jim Walter, director of threat intelligence operations at security technology company McAfee – meaning that the heists could have easily been stopped by existing antivirus software had administrators responded to the warnings. The size of the thefts has resulted in major attention from state and Federal United States authorities and the investigation is ongoing.
Example Output: What was done when credit cards were stolen? 

Example Input: Passage: An alloy is a mixture of metals or a mixture of a metal and another element. Alloys are defined by metallic bonding character. An alloy may be a solid solution of metal elements (a single phase) or a mixture of metallic phases (two or more solutions). Intermetallic compounds are alloys with a defined stoichiometry and crystal structure. Zintl phases are also sometimes considered alloys depending on bond types (see also: Van Arkel-Ketelaar triangle for information on classifying bonding in binary compounds).
Example Output: What is always a mixture of metal and other elements?

Example Input: Passage: The Presbyterian Church in Taiwan (PCT) is by far the largest Protestant denomination in Taiwan, with some 238,372 members as of 2009 (including a majority of the island's aborigines). English Presbyterian missionary James Laidlaw Maxwell established the first Presbyterian church in Tainan in 1865. His colleague George Leslie Mackay, of the Canadian Presbyterian Mission, was active in Danshui and north Taiwan from 1872 to 1901; he founded the island's first university and hospital, and created a written script for Taiwanese Minnan. The English and Canadian missions joined together as the PCT in 1912. One of the few churches permitted to operate in Taiwan through the era of Japanese rule (1895–1945), the PCT experienced rapid growth during the era of Guomindang-imposed martial law (1949–1987), in part due to its support for democracy, human rights, and Taiwan independence. Former ROC president Lee Teng-hui (in office 1988–2000) is a Presbyterian.
Example Output:
The PCT has 1,865 members as of what year?