question:
The headquarters of the GLA is City Hall, Southwark; the mayor is Boris Johnson.
Who is the current Mayor of London?

answer: yes

question:
The Allied Powers, led by the British Empire, France, Russia until March 1918, Japan and the United States after 1917, defeated the Central Powers, led by the German Empire, Austro-Hungarian Empire and the Ottoman Empire.
Who defeated the Central Powers led by the German Empire Austro-Hungarian Empire and the Ottoman Empire??

answer: yes

question:
The BOM, code point U+FEFF has the important property of unambiguity on byte reorder, regardless of the Unicode encoding used; U+FFFE (the result of byte-swapping U+FEFF) does not equate to a legal character, and U+FEFF in other places, other than the beginning of text, conveys the zero-width non-break space (a character with no appearance and no effect other than preventing the formation of ligatures).
What does BOM stand for?

answer: no

question:
In Hellenistic Egypt, the mathematician Euclid laid down the foundations of mathematical rigor and introduced the concepts of definition, axiom, theorem and proof still in use today in his Elements, considered the most influential textbook ever written.
What was contained within the book Elements?

answer:
yes