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.

Example Input: proper question: When did the Ottoman Empire fall? 
 disfluent question: When did the reign of Suleiman the Magnificent no um Ottoman Empire fall? 
 context: The Ottoman Empire was an imperial state that lasted from 1299 to 1923. During the 16th and 17th centuries, in particular at the height of its power under the reign of Suleiman the Magnificent, the Ottoman Empire was a powerful multinational, multilingual empire controlling much of Southeast Europe, Western Asia, the Caucasus, North Africa, and the Horn of Africa. At the beginning of the 17th century the empire contained 32 provinces and numerous vassal states. Some of these were later absorbed into the empire, while others were granted various types of autonomy during the course of centuries.
Example Output: 1923

Example Input: proper question: What is the key bed? 
 disfluent question: What can you say about a fault that penetrates the top rocks and sorry but not the lower formations? 
 context: The principle of cross-cutting relationships pertains to the formation of faults and the age of the sequences through which they cut. Faults are younger than the rocks they cut; accordingly, if a fault is found that penetrates some formations but not those on top of it, then the formations that were cut are older than the fault, and the ones that are not cut must be younger than the fault. Finding the key bed in these situations may help determine whether the fault is a normal fault or a thrust fault.
Example Output: None

Example Input: proper question: What cause city funding to increase? 
 disfluent question: What causes dissipated no city funding to increase? 
 context: Much of the city's tax base dissipated, leading to problems with funding education, sanitation, and traffic control within the city limits. In addition, residents in unincorporated suburbs had difficulty obtaining municipal services, such as sewage and building code enforcement. In 1958, a study recommended that the city of Jacksonville begin annexing outlying communities in order to create the needed tax base to improve services throughout the county. Voters outside the city limits rejected annexation plans in six referendums between 1960 and 1965.
Example Output:
None