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.

proper question: What summary says that human activity is responsible for the earths cooling? 
 disfluent question: What summary states that greenhouse effect no not that I mean human activity that is responsible for the earth's cooling? 
 context: The executive summary of the WG I Summary for Policymakers report says they are certain that emissions resulting from human activities are substantially increasing the atmospheric concentrations of the greenhouse gases, resulting on average in an additional warming of the Earth's surface. They calculate with confidence that CO2 has been responsible for over half the enhanced greenhouse effect. They predict that under a business as usual (BAU) scenario, global mean temperature will increase by about 0.3 °C per decade during the [21st] century. They judge that global mean surface air temperature has increased by 0.3 to 0.6 °C over the last 100 years, broadly consistent with prediction of climate models, but also of the same magnitude as natural climate variability. The unequivocal detection of the enhanced greenhouse effect is not likely for a decade or more.
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proper question: What conjecture holds that there are always a minimum of 4 primes  between the squares of consecutive primes greater than 2? 
 disfluent question: Which or rather what conjecture holds that there are always a minimum of 4 primes between the squares of consecutive primes greater than 2? 
 context: A third type of conjectures concerns aspects of the distribution of primes. It is conjectured that there are infinitely many twin primes, pairs of primes with difference 2 (twin prime conjecture). Polignac's conjecture is a strengthening of that conjecture, it states that for every positive integer n, there are infinitely many pairs of consecutive primes that differ by 2n. It is conjectured there are infinitely many primes of the form n2 + 1. These conjectures are special cases of the broad Schinzel's hypothesis H. Brocard's conjecture says that there are always at least four primes between the squares of consecutive primes greater than 2. Legendre's conjecture states that there is a prime number between n2 and (n + 1)2 for every positive integer n. It is implied by the stronger Cramér's conjecture.
Brocard's

proper question: When did John of London come to live in Cambridge? 
 disfluent question: Who founded or rather when did John of London come to live in Cambridge? 
 context: Harvard was formed in 1636 by vote of the Great and General Court of the Massachusetts Bay Colony. It was initially called New College or the college at New Towne. In 1638, the college became home for North America's first known printing press, carried by the ship John of London. In 1639, the college was renamed Harvard College after deceased clergyman John Harvard, who was an alumnus of the University of Cambridge. He had left the school £779 and his library of some 400 books. The charter creating the Harvard Corporation was granted in 1650.

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