Definition: 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: Passage: On June 18, 2009, the National Archives announced the launching of a YouTube channel "to showcase popular archived films, inform the public about upcoming events around the country, and bring National Archives exhibits to the people." Also in 2009, the National Archives launched a Flickr photostream to share portions of its photographic holdings with the general public. A new teaching with documents website premiered in 2010 and was developed by the education team. The website features 3,000 documents, images, and recordings from the holdings of the Archives. The site also features lesson plans and tools for creating new classroom activities and lessons.
Output:
On what date did YouTube begin showing videos online?