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.

Input: Consider Input: Passage: In 1906, the tungsten filament was introduced. Tungsten metal was initially not available in a form that allowed it to be drawn into fine wires. Filaments made from sintered tungsten powder were quite fragile. By 1910, a process was developed by William D. Coolidge at General Electric for production of a ductile form of tungsten. The process required pressing tungsten powder into bars, then several steps of sintering, swaging, and then wire drawing. It was found that very pure tungsten formed filaments that sagged in use, and that a very small "doping" treatment with potassium, silicon, and aluminium oxides at the level of a few hundred parts per million greatly improved the life and durability of the tungsten filaments.

Output: What was introduced in 1900?

Input: Consider Input: Passage: YouTube entered into a marketing and advertising partnership with NBC in June 2006. In November 2008, YouTube reached an agreement with MGM, Lions Gate Entertainment, and CBS, allowing the companies to post full-length films and television episodes on the site, accompanied by advertisements in a section for US viewers called "Shows". The move was intended to create competition with websites such as Hulu, which features material from NBC, Fox, and Disney. In November 2009, YouTube launched a version of "Shows" available to UK viewers, offering around 4,000 full-length shows from more than 60 partners. In January 2010, YouTube introduced an online film rentals service, which is available only to users in the US, Canada and the UK as of 2010. The service offers over 6,000 films.

Output: Who entered into a partnership during June 2008 with NBC?

Input: Consider Input: Passage: The trophy comes in three parts - the cup itself, plus a lid and a base. There have been two designs of trophy in use, but five physical trophies have been presented. The original trophy, known as the "little tin idol", was 18 inches high and made by Martin, Hall & Co. It was stolen in 1895 and never recovered, and so was replaced by an exact replica, used until 1910. The FA decided to change the design after the 1909 winners, Manchester United, made their own replica, leading the FA to realise they did not own the copyright. This new, larger design was by Messers Fattorini and Sons, and was used from 1911. In order to preserve this original, from 1992 it was replaced by an exact replica, although this had to be replaced after just over two decades, after showing wear and tear from being handled more than in previous eras. This third replica, first used in 2014, was built heavier to withstand the increased handling. Of the four surviving trophies, only the 1895 replica has entered private ownership.
Output: When was the original trophy created?