Given a disfluent sentence, modify the sentence to it to its equivalent fluent form, preserving the meaning of the sentence.

[EX Q]: What happens when the what cause the immune system to treat foreign organisms like normal tissues?
[EX A]: What causes the immune system to treat foreign organisms like normal tissues?

[EX Q]: What British mathematician took pride in doing work that he felt had no cryptography benefit, no no sorry, mathematical?
[EX A]: What British mathematician took pride in doing work that he felt had no mathematical benefit?

[EX Q]: What was x.25 sorry AUSTPAC?
[EX A]:
What was AUSTPAC