Even though we think we know the answer the other person got to give to the questions we have, it's wise to still put forward the questions for discussion. Couple of advantages to it; one, we get to know if the answer that we think we know is right in the first place or not; and two, we get to understand how the answer can be conveyed if at all we need to give similar kind of answer to anybody else in similar situations later.
Discussions are important. Putting forward the questions is important. Also, its important not lose temper during the discussions to get maximum out of them.