Constant Content

When I signed up for Constant Content about five years ago, I remember reading something about using a question as the title of an article and the conditions under which we were allowed to do that. Up until now, I haven't needed to, but I have noticed in the past that several of my article titles would have worked better as questions. Because most of the buyers are using these articles for their websites, an article with a title question seems like it would be more likely to snag visitors since so many people type exact questions into search engines rather than just key terms. I was wondering if anyone could refresh my memory on this subject? Is it perfectly fine to use a question as the title? Does anyone here do this regularly with no problem?

I do that quite a lot, and haven't had a problem, but maybe I am obeying some rule restricting titles with questions without knowing what it is.... two recent ones were: Hope ahead for bla bla bla? and what's so good about bla? so I think you're probably ok.