instruction:
Generate a correct and concise answer for the question based on the words in the context.
question:
Context : Blind Willie Walker died in Greenville in 1933 at age 37 of congenital syphilis, which may have been the reason for his blindness. 
Question : What led to Blind Willie Walker's death?
answer:
blindness


question:
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?
answer:
A Clockwork Orange


question:
Context : In 1961, the first M79 grenade launchers were delivered to the US Army. 
Question : What was the year M79 grenade launcher entered service?
answer:

1961