instruction:
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.
question:
proper question: What happens to some sheaths on cydippids to change their size? 
 disfluent question: What  is the mouth of a pleurobrachia kept in no forget that and tell me what happens to some sheaths on cydippids to change their size? 
 context: Cydippid ctenophores have bodies that are more or less rounded, sometimes nearly spherical and other times more cylindrical or egg-shaped; the common coastal sea gooseberry, Pleurobrachia, sometimes has an egg-shaped body with the mouth at the narrow end, although some individuals are more uniformly round. From opposite sides of the body extends a pair of long, slender tentacles, each housed in a sheath into which it can be withdrawn. Some species of cydippids have bodies that are flattened to various extents, so that they are wider in the plane of the tentacles.
answer:
None


question:
proper question: Of what mathematical nature is the prime problem? 
 disfluent question: What function is related to Basel numbers or wait tell me what kind of mathematical nature prime problems are? 
 context: The zeta function is closely related to prime numbers. For example, the aforementioned fact that there are infinitely many primes can also be seen using the zeta function: if there were only finitely many primes then ζ(1) would have a finite value. However, the harmonic series 1 + 1/2 + 1/3 + 1/4 + ... diverges (i.e., exceeds any given number), so there must be infinitely many primes. Another example of the richness of the zeta function and a glimpse of modern algebraic number theory is the following identity (Basel problem), due to Euler,
answer:
None


question:
proper question: The two former deputies of Parliament are whom? 
 disfluent question: Who is elected using an open ballot or wait who are the two former deputies of Parliament? 
 context: After each election to the Scottish Parliament, at the beginning of each parliamentary session, Parliament elects one MSP to serve as Presiding Officer, the equivalent of the speaker (currently Tricia Marwick), and two MSPs to serve as deputies (currently Elaine Smith and John Scott). The Presiding Officer and deputies are elected by a secret ballot of the 129 MSPs, which is the only secret ballot conducted in the Scottish Parliament. Principally, the role of the Presiding Officer is to chair chamber proceedings and the Scottish Parliamentary Corporate Body. When chairing meetings of the Parliament, the Presiding Officer and his/her deputies must be politically impartial. During debates, the Presiding Officer (or the deputy) is assisted by the parliamentary clerks, who give advice on how to interpret the standing orders that govern the proceedings of meetings. A vote clerk sits in front of the Presiding Officer and operates the electronic voting equipment and chamber clocks.
answer:

None