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

[EX Q]: Context : Based on the TR-77-580 (Romanian-built version of the Soviet T-55 tank), the TR-85 tank was developed from 1978 to 1985 and produced from 1986 until 1990. 
Question : Which was the official year for the approval of TR-85?
[EX A]: 1986

[EX Q]: Context : María Elena Perla López Loyo (born 2 April 1951) is a Mexican politician from the Institutional Revolutionary Party. 
Question : What kind of  occupation does Perla López Loyo have?
[EX A]: politician

[EX Q]: Context : Leon Botha (4 June 1985 -- 5 June 2011) was a South African painter and disk jockey, as well as one of the world's oldest survivors of progeria. 
Question : What illness negatively impacted Leon Botha?
[EX A]:
progeria