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: State educational and economic development where helped by what?
disfluent question: Why was er instead state educational and economic development where helped by what?
context: Merit Network, Inc., an independent non-profit 501(c)(3) corporation governed by Michigan's public universities, was formed in 1966 as the Michigan Educational Research Information Triad to explore computer networking between three of Michigan's public universities as a means to help the state's educational and economic development. With initial support from the State of Michigan and the National Science Foundation (NSF), the packet-switched network was first demonstrated in December 1971 when an interactive host to host connection was made between the IBM mainframe computer systems at the University of Michigan in Ann Arbor and Wayne State University in Detroit. In October 1972 connections to the CDC mainframe at Michigan State University in East Lansing completed the triad. Over the next several years in addition to host to host interactive connections the network was enhanced to support terminal to host connections, host to host batch connections (remote job submission, remote printing, batch file transfer), interactive file transfer, gateways to the Tymnet and Telenet public data networks, X.25 host attachments, gateways to X.25 data networks, Ethernet attached hosts, and eventually TCP/IP and additional public universities in Michigan join the network. All of this set the stage for Merit's role in the NSFNET project starting in the mid-1980s.
Example Output: None

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 Yuan policies did Muslims dislike?
disfluent question: What Han uh rather Yuan policies did Muslims dislike?
context: Despite the high position given to Muslims, some policies of the Yuan Emperors severely discriminated against them, restricting Halal slaughter and other Islamic practices like circumcision, as well as Kosher butchering for Jews, forcing them to eat food the Mongol way. Toward the end, corruption and the persecution became so severe that Muslim generals joined Han Chinese in rebelling against the Mongols. The Ming founder Zhu Yuanzhang had Muslim generals like Lan Yu who rebelled against the Mongols and defeated them in combat. Some Muslim communities had a Chinese surname which meant barracks and could also mean thanks. Many Hui Muslims claim this is because that they played an important role in overthrowing the Mongols and it was given in thanks by the Han Chinese for assisting them. During the war fighting the Mongols, among the Ming Emperor Zhu Yuanzhang's armies was the Hui Muslim Feng Sheng. The Muslims in the semu class also revolted against the Yuan dynasty in the Ispah Rebellion but the rebellion was crushed and the Muslims were massacred by the Yuan loyalist commander Chen Youding.
Example Output:
restricting Halal slaughter and other Islamic practices like circumcision