What topic type we should use for bug report?

What topic type we should use for bug report?

Idea - I have idea for you gus to fix a bug, but I hardly think that that is what I should use. This is I guess for ideas for new features.
Disscusion - I would love to disscus why bugs exist and what are your plans to solve them (or disscuse about long time promised features and fixess) but bug reporting is not disscusion
Question - Could be a question. Why is this wierd behaviour happening? But, I guess question is more for "How do I..."

So, support, what topic type you want us to select when we just want to report and describe a bug?