Problem: Nanjing:

Port of Nanjing is the largest inland port in China, with annual cargo tonnage reached 191,970,000 t in 2012. The port area is 98 kilometres (61 mi) in length and has 64 berths including 16 berths for ships with a tonnage of more than 10,000. Nanjing is also the biggest container port along the Yangtze River; in March 2004, the one million container-capacity base, Longtan Containers Port Area opened, further consolidating Nanjing as the leading port in the region. As of 2010, it operated six public ports and three industrial ports.

How many berths does the Port contain?
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A: 64

Problem: Standard Chinese (Mandarin) has stops and affricates distinguished by aspiration: for instance, /t t/, /ts ts/. In pinyin, tenuis stops are written with letters that represent voiced consonants in English, and aspirated stops with letters that represent voiceless consonants. Thus d represents /t/, and t represents /t/.
What kind of stops in pinyin are written with letters that representative of voiceless consonants?
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Answer: aspirated stops

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The word ale comes from Old English ealu (plural ealo), in turn from Proto-Germanic *alu (plural *alu), ultimately from the Proto-Indo-European base *helut-, which holds connotations of "sorcery, magic, possession, intoxication". The word beer comes from Old English beor, from Proto-Germanic *beuza, probably from Proto-Indo-European *beusom, originally "brewer's yeast, beer dregs", although other theories have been provided connecting the word with Old English beow, "barley", or Latin bibere, "to drink". On the currency of two words for the same thing in the Germanic languages, the 12th-century Old Icelandic poem Alvissmal says, "Ale it is called among men, but among the gods, beer."
What does the 12th-Century Old Germanic poem Alvissmal say?
A: unanswerable

Context and question: However, according to research firm NPD, sales of devices running Windows in the United States have declined 21 percent compared to the same time period in 2011. As the holiday shopping season wrapped up, Windows 8 sales continued to lag, even as Apple reported brisk sales. The market research firm IDC reported an overall drop in PC sales for the quarter, and said the drop may have been partly due to consumer reluctance to embrace the new features of the OS and poor support from OEM for these features. This capped the first year of declining PC sales to the Asia Pacific region, as consumers bought more mobile devices than Windows PCs.
What is the increase in PC sales attributed to?
Answer: unanswerable

Question: Technologies based upon the polymerase chain reaction (PCR) method will become nearly ubiquitous gold standards of diagnostics of the near future, for several reasons. First, the catalog of infectious agents has grown to the point that virtually all of the significant infectious agents of the human population have been identified. Second, an infectious agent must grow within the human body to cause disease; essentially it must amplify its own nucleic acids in order to cause a disease. This amplification of nucleic acid in infected tissue offers an opportunity to detect the infectious agent by using PCR. Third, the essential tools for directing PCR, primers, are derived from the genomes of infectious agents, and with time those genomes will be known, if they are not already.
Is there an answer to this question: What has the catalog of infectious agents decreased to the point of?

Answer: unanswerable

Question: The presence of the University of California, San Diego and other research institutions has helped to fuel biotechnology growth. In 2013, San Diego has the second-largest biotech cluster in the United States, below the Boston area and above the San Francisco Bay Area. There are more than 400 biotechnology companies in the area. In particular, the La Jolla and nearby Sorrento Valley areas are home to offices and research facilities for numerous biotechnology companies. Major biotechnology companies like Illumina and Neurocrine Biosciences are headquartered in San Diego, while many biotech and pharmaceutical companies have offices or research facilities in San Diego. San Diego is also home to more than 140 contract research organizations (CROs) that provide a variety of contract services for pharmaceutical and biotechnology companies.
Is there an answer to this question: How many contract research organizations are in San Francisco?

Answer:
unanswerable