instruction:
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.
question:
Passage: Paleoclimatologists measure the ratio of oxygen-18 and oxygen-16 in the shells and skeletons of marine organisms to determine what the climate was like millions of years ago (see oxygen isotope ratio cycle). Seawater molecules that contain the lighter isotope, oxygen-16, evaporate at a slightly faster rate than water molecules containing the 12% heavier oxygen-18; this disparity increases at lower temperatures. During periods of lower global temperatures, snow and rain from that evaporated water tends to be higher in oxygen-16, and the seawater left behind tends to be higher in oxygen-18. Marine organisms then incorporate more oxygen-18 into their skeletons and shells than they would in a warmer climate. Paleoclimatologists also directly measure this ratio in the water molecules of ice core samples that are up to several hundreds of thousands of years old.
answer:
Who measures oxygen-18 and oxygen-16 in skeletons of all organisms?


question:
Passage: Sichuan consists of two geographically very distinct parts. The eastern part of the province is mostly within the fertile Sichuan basin (which is shared by Sichuan with Chongqing Municipality). The western Sichuan consists of the numerous mountain ranges forming the easternmost part of the Qinghai-Tibet Plateau, which are known generically as Hengduan Mountains. One of these ranges, Daxue Mountains, contains the highest point of the province Gongga Shan, at 7,556 metres (24,790 ft) above sea level.
answer:
What province has similar eastern and western parts?


question:
Passage: Rugby union is the national sport in Samoa and the national team, nicknamed the Manu Samoa, is consistently competitive against teams from vastly more populous nations. Samoa has competed at every Rugby World Cup since 1991, and made the quarter finals in 1991, 1995 and the second round of the 1999 world cup. At the 2003 world cup, Manu Samoa came close to beating eventual world champions, England. Samoa also played in the Pacific Nations Cup and the Pacific Tri-Nations The sport is governed by the Samoa Rugby Football Union, who are members of the Pacific Islands Rugby Alliance, and thus, also contribute to the international Pacific Islanders rugby union team.
answer:

What is the national sport in England?