We are planning to do a controlled assessment soon. Can the question be given in advance so that it can be discussed in class?
Yes. This is exactly the way controlled assessment should be delivered. If students are going to be writing a piece on Lady Macbeth at the end of a number of weeks of teaching, they should know this before the teaching of the topic begins. This is part of the preparation phase which allows them to make all the necessary notes and carry out all the research they need before they begin planning their individual response to the title.