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

Q: The function of long-lived memory cells is an example of which or no make that what kind of immune response?

A: The function of long-lived memory cells is an example of what kind of immune response?
****
Q: What type of math was not advanced during Zhu Shijie's time no scratch that I want to know what modern math concept did Zhu Shijie do work similar to?

A: What modern math concept did Zhu Shijie do work similar to?
****
Q: What is London's no make that Warsaw's economy characterized by?

A:
What is Warsaw's economy characterized by?
****