Use a disfluent question or a proper question and find the answer to the question based on the given context or return None if an answer can't be found. A disfluent question is a question that has some interruptions in it while framing. A proper question is the correct form of the question without any disfluency.

Let me give you an example: proper question: In what year did the U of C become one of 7 founding members of the Association of Chicago Universities? 
 disfluent question: In what year did Robert Harper or did the U of C become one of 7 founding members of the Association of Chicago Universities? 
 context: Founded by the American Baptist Education Society with a donation from oil magnate and wealthiest man in history John D. Rockefeller, the University of Chicago was incorporated in 1890; William Rainey Harper became the university's first president in 1891, and the first classes were held in 1892. Both Harper and future president Robert Maynard Hutchins advocated for Chicago's curriculum to be based upon theoretical and perennial issues rather than on applied sciences and commercial utility. With Harper's vision in mind, the University of Chicago also became one of the 14 founding members of the Association of American Universities, an international organization of leading research universities, in 1900.
The answer to this example can be: None
Here is why: The answer to the above question is not found from the context hence it is not answerable so the output is 'None' so it is a positive example.

OK. solve this:
proper question: Which theory suggested people in the tropics were uncivilized? 
 disfluent question: Which theory suggested people in the deserts sorry the tropics were uncivilized? 
 context: Geographical theories such as environmental determinism also suggested that tropical environments created uncivilized people in need of European guidance. For instance, American geographer Ellen Churchill Semple argued that even though human beings originated in the tropics they were only able to become fully human in the temperate zone. Tropicality can be paralleled with Edward Said’s Orientalism as the west’s construction of the east as the “other”. According to Siad, orientalism allowed Europe to establish itself as the superior and the norm, which justified its dominance over the essentialized Orient.
Answer:
environmental determinism