Generate a correct and concise answer for the question based on the words in the context.

[EX Q]: Context : A-Lex is based on the 1962 book A Clockwork Orange by Anthony Burgess, which in 1971 was adapted into a film version by Stanley Kubrick. 
Question : The A-Lex is based upon what?
[EX A]: A Clockwork Orange

[EX Q]: Context : Helen Pitts Douglass (1838 -- 1903) was an American suffragist and abolitionist, best known for being the second wife of Frederick Douglass. 
Question : What is Helen Pitts Douglass's spouse's name?
[EX A]: Frederick Douglass

[EX Q]: Context : Heidi El Tabakh (born September 25, 1986) is an Egyptian-born Canadian professional tennis player from Toronto, Ontario, Canada. 
Question : What city is Heidi El Tabakh associated with?
[EX A]:
Toronto