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

[EX Q]: What is the name of a prime number, oops my bad, an algebraic structure in which addition, subtraction and multiplication are defined?
[EX A]: What is the name of an algebraic structure in which addition, subtraction and multiplication are defined?

[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]: How many people lived in Italy or rather Egypt at the start of the Black Death?
[EX A]:
How many people lived in Egypt at the start of the Black Death?