'which' paragraph or 'what' paragraph?

[tulipflower]

Which one is more acceptable: 'which paragraph' or 'what paragraph'?

 

[tulipflower]

For example, in my class, I ask a student which/what paragraph he is going to read.

 

[jutfrank]

In that case, it appears you should use which.

It might be a good idea to find out the different uses of which and what. Your question suggests that you're not aware of this.