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: What does paleotopography study? 
 disfluent question: What does radioactive elements no paleotopography study? 
 context: For many geologic applications, isotope ratios of radioactive elements are measured in minerals that give the amount of time that has passed since a rock passed through its particular closure temperature, the point at which different radiometric isotopes stop diffusing into and out of the crystal lattice. These are used in geochronologic and thermochronologic studies. Common methods include uranium-lead dating, potassium-argon dating, argon-argon dating and uranium-thorium dating. These methods are used for a variety of applications. Dating of lava and volcanic ash layers found within a stratigraphic sequence can provide absolute age data for sedimentary rock units which do not contain radioactive isotopes and calibrate relative dating techniques. These methods can also be used to determine ages of pluton emplacement. Thermochemical techniques can be used to determine temperature profiles within the crust, the uplift of mountain ranges, and paleotopography.
Example Output: None

Example Input: proper question: How many years did it take for the Spring snow covers to melt? 
 disfluent question: When did no how many years did it take for the Spring snow covers to melt? 
 context: As northwest Europe slowly began to warm up from 22,000 years ago onward, frozen subsoil and expanded alpine glaciers began to thaw and fall-winter snow covers melted in spring. Much of the discharge was routed to the Rhine and its downstream extension. Rapid warming and changes of vegetation, to open forest, began about 13,000 BP. By 9000 BP, Europe was fully forested. With globally shrinking ice-cover, ocean water levels rose and the English Channel and North Sea re-inundated. Meltwater, adding to the ocean and land subsidence, drowned the former coasts of Europe transgressionally.
Example Output: None

Example Input: proper question: How do bills pass through Parliament? 
 disfluent question: Who may introduce bills rather how do they pass through Parliament? 
 context: Bills can be introduced to Parliament in a number of ways; the Scottish Government can introduce new laws or amendments to existing laws as a bill; a committee of the Parliament can present a bill in one of the areas under its remit; a member of the Scottish Parliament can introduce a bill as a private member; or a private bill can be submitted to Parliament by an outside proposer. Most draft laws are government bills introduced by ministers in the governing party. Bills pass through Parliament in a number of stages:
Example Output:
a number of stages