Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The multitude of Middle Iranian languages and peoples indicate that great linguistic diversity must have existed among the ancient speakers of Iranian languages. Of that variety of languages/dialects, direct evidence of only two have survived. These are:
How many middle Iranian languages are still spoken today?
A: unanswerable

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No one party to a treaty can impose its particular interpretation of the treaty upon the other parties. Consent may be implied, however, if the other parties fail to explicitly disavow that initially unilateral interpretation, particularly if that state has acted upon its view of the treaty without complaint. Consent by all parties to the treaty to a particular interpretation has the legal effect of adding another clause to the treaty this is commonly called an 'authentic interpretation'.
The legal effect of adding another clause to a treaty that occurs when all parties to a treaty consent to a particular interpretation of the treaty is commonly known as what?
A: an 'authentic interpretation'

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In 1785, the assembly of the Congress of the Confederation made New York the national capital shortly after the war. New York was the last capital of the U.S. under the Articles of Confederation and the first capital under the Constitution of the United States. In 1789, the first President of the United States, George Washington, was inaugurated; the first United States Congress and the Supreme Court of the United States each assembled for the first time, and the United States Bill of Rights was drafted, all at Federal Hall on Wall Street. By 1790, New York had surpassed Philadelphia as the largest city in the United States.
By which year, did New York City become the largest city in the United States?
A: 1790

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Saint Helena has the international calling code +290 which, since 2006, Tristan da Cunha shares. Saint Helena telephone numbers changed from 4 to 5 digits on 1 October 2013 by being prefixed with the digit "2", i.e. 2xxxx, with the range 5xxxx being reserved for mobile numbering, and 8xxx being used for Tristan da Cunha numbers (these still shown as 4 digits).
What digit are Saint Helena phone numbers prefixed with?
A:
2