TASK 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.
PROBLEM: Passage: The effects of local surface low pressure are extremely limited because upper-level subsidence still continues to block any form of air ascent. Also, to be protected against rain-bearing weather systems by the atmospheric circulation itself, the desert is made even drier by his geographical configuration and location. Indeed, the extreme aridity of the Sahara can't be only explained by the subtropical high pressure. The Atlas Mountains, found in Algeria, Morocco and Tunisia also help to enhance the aridity of the northern part of the desert. These major mountain ranges act as a barrier causing a strong rain shadow effect on the leeward side by dropping much of the humidity brought by atmospheric disturbances along the polar front which affects the surrounding Mediterranean climates.

SOLUTION: what is blocked buy the surface low pressure?

PROBLEM: Passage: The university's Medical Center and University Hospital are located in Kansas City, Kansas. The Edwards Campus is in Overland Park, Kansas, in the Kansas City metropolitan area. There are also educational and research sites in Parsons and Topeka, and branches of the University of Kansas School of Medicine in Wichita and Salina. The university is one of the 62 members of the Association of American Universities.

SOLUTION: In what two cities are there satellite locations for KU's law school?

PROBLEM: Passage: In 1661 another Jesuit, Johann Grueber, crossed Tibet from Sining to Lhasa (where he spent a month), before heading on to Nepal. He was followed by others who actually built a church in Lhasa. These included the Jesuit Father Ippolito Desideri, 17161721, who gained a deep knowledge of Tibetan culture, language and Buddhism, and various Capuchins in 17071711, 17161733 and 17411745, Christianity was used by some Tibetan monarchs and their courts and the Karmapa sect lamas to counterbalance the influence of the Gelugpa sect in the 17th century until in 1745 when all the missionaries were expelled at the lama's insistence.

SOLUTION:
Who crossed Nepal before heading to Tibet in 1661?