Definition: 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.
Input: 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).
Output:
Europe