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.

Ex Input:
proper question: What was the topic of the error?
disfluent question: Who or rather what was the topic of the error?
context: Former IPCC chairman Robert Watson has said The mistakes all appear to have gone in the direction of making it seem like climate change is more serious by overstating the impact. That is worrying. The IPCC needs to look at this trend in the errors and ask why it happened. Martin Parry, a climate expert who had been co-chair of the IPCC working group II, said that What began with a single unfortunate error over Himalayan glaciers has become a clamour without substance and the IPCC had investigated the other alleged mistakes, which were generally unfounded and also marginal to the assessment.

Ex Output:
Himalayan glaciers

Ex Input:
proper question: KPN referred to Datanet 1 as
disfluent question: What is KPN no wait KPN referred to Datanet 1 as
context: Datanet 1 was the public switched data network operated by the Dutch PTT Telecom (now known as KPN). Strictly speaking Datanet 1 only referred to the network and the connected users via leased lines (using the X.121 DNIC 2041), the name also referred to the public PAD service Telepad (using the DNIC 2049). And because the main Videotex service used the network and modified PAD devices as infrastructure the name Datanet 1 was used for these services as well. Although this use of the name was incorrect all these services were managed by the same people within one department of KPN contributed to the confusion.

Ex Output:
None

Ex Input:
proper question: Why might customers not order from internet pharmacies?
disfluent question: Why might Internet pharmacies sell prescription drugs I mean customers not order from internet pharmacies?
context: While most Internet pharmacies sell prescription drugs and require a valid prescription, some Internet pharmacies sell prescription drugs without requiring a prescription. Many customers order drugs from such pharmacies to avoid the inconvenience of visiting a doctor or to obtain medications which their doctors were unwilling to prescribe. However, this practice has been criticized as potentially dangerous, especially by those who feel that only doctors can reliably assess contraindications, risk/benefit ratios, and an individual's overall suitability for use of a medication. There also have been reports of such pharmacies dispensing substandard products.

Ex Output:
None