Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.
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Question: Context : ''The Cartridge Family'' is the fifth episode of The Simpsons' ninth season, which originally aired on Fox in the United States on November 2, 1997.
Answer : The Simpsons

Answer: What series is the episode The Cartridge Family part of?

Question: Context : Arthur Shirley (31 August 1886 -- 24 November 1967) was an Australian actor, writer, producer and director of theatre and film.
Answer : 24 November 1967

Answer: What was the date of Arthur Shirley's death?

Question: Context : In cryptography, DES-X (or DESX) is a variant on the DES (Data Encryption Standard) symmetric-key block cipher intended to increase the complexity of a brute force attack using a technique called key whitening.
Answer : Data Encryption Standard

Answer:
Which is the basis of DES-X?