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: Conventional ("tailhook") aircraft rely upon a landing signal officer (LSO, radio call sign paddles) to monitor the aircraft's approach, visually gauge glideslope, attitude, and airspeed, and transmit that data to the pilot. Before the angled deck emerged in the 1950s, LSOs used colored paddles to signal corrections to the pilot (hence the nickname). From the late 1950s onward, visual landing aids such as Optical Landing System have provided information on proper glide slope, but LSOs still transmit voice calls to approaching pilots by radio.

Output: What does OSL stand for?


Input: Consider Input: Passage: Literature allows readers to access intimate emotional aspects of a person’s character that would not be obvious otherwise. It benefits the psychological development and understanding of the reader. For example, it allows a person to access emotional states from which the person has distanced himself or herself. An entry written by D. Mitchell featured in ‘‘The English Journal’’ explains how the author utilized young adult literature in order to re-experience the emotional psychology she experienced as a child which she describes as a state of “wonder”.

Output: What gives readers access to physical aspects of a character?


Input: Consider Input: Passage: Between 1590–1712 the Dutch also possessed one of the strongest and fastest navies in the world, allowing for their varied conquests including breaking the Portuguese sphere of influence on the Indian Ocean and in the Orient, as well as a lucrative slave trade from Africa and the Pacific.


Output: From what location did the Portugese operate a slave trade?