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.

Q: proper question: Who challenged the plague theory first?
disfluent question: What did or first tell me who challenged the plague theory first?
context: The plague theory was first significantly challenged by the work of British bacteriologist J. F. D. Shrewsbury in 1970, who noted that the reported rates of mortality in rural areas during the 14th-century pandemic were inconsistent with the modern bubonic plague, leading him to conclude that contemporary accounts were exaggerations. In 1984 zoologist Graham Twigg produced the first major work to challenge the bubonic plague theory directly, and his doubts about the identity of the Black Death have been taken up by a number of authors, including Samuel K. Cohn, Jr. (2002), David Herlihy (1997), and Susan Scott and Christopher Duncan (2001).

A: J. F. D. Shrewsbury
****
Q: proper question: Which region invented the machine gun?
disfluent question: Which region did not invent the machine gun no sorry just tell me which region did?
context: Along with advancements in communication, Europe also continued to advance in military technology. European chemists made deadly explosives that could be used in combat, and with innovations in machinery they were able to manufacture improved firearms. By the 1880s, the machine gun had become an effective battlefield weapon. This technology gave European armies an advantage over their opponents, as armies in less-developed countries were still fighting with arrows, swords, and leather shields (e.g. the Zulus in Southern Africa during the Anglo-Zulu War of 1879).

A: Europe
****
Q: proper question: What have the clinics infrastructure done a lot of over the past years?
disfluent question: What have the clinics section uh no sorry infrastructure done a lot of over the past years?
context: Today, Warsaw has some of the best medical facilities in Poland and East-Central Europe. The city is home to the Children's Memorial Health Institute (CMHI), the highest-reference hospital in all of Poland, as well as an active research and education center. While the Maria Skodowska-Curie Institute of Oncology it is one of the largest and most modern oncological institutions in Europe. The clinical section is located in a 10-floor building with 700 beds, 10 operating theatres, an intensive care unit, several diagnostic departments as well as an outpatient clinic. The infrastructure has developed a lot over the past years.

A:
None
****