TASK DEFINITION: Generate a correct and concise answer for the question based on the words in the context.
PROBLEM: 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?

SOLUTION: blindness

PROBLEM: Context : The 2007 Balad aircraft crash was a 9 January 2007 airplane incident involving an Antonov An-26 airliner, which crashed while attempting to land at the Joint Base Balad in Balad, Iraq, which was at that time operated by the United States Air Force. 
Question : On what date did 2007 Balad aircraft crash occur?

SOLUTION: 9 January 2007

PROBLEM: Context : Also this year, in a ceremony in memory friend has died, a male friend (Đàm Vĩnh Hưng's guitar) and female singing has rendered Tuoi Hong Tho Ngay. 
Question : What is the sex of Đàm Vĩnh Hưng?

SOLUTION:
male