I'm looking for a word or idiomatic phrase to describe a question that can be answered by a "yes" or "no", but has a higher probability of getting a more open-ended response.
Indeed, without the "yes/no" requirement I'd describe what I'm looking for as an "open ended question", but the possibility to answer "yes/no" is key here.
An example question would be:
Do you feel remorse for your affiliations with the Nazi party?
Although it doesn't have to be a loaded question, just something which you are reasonably sure is going to get the responder talking beyond the y/n