⟩ Tell me about your current role?
If the candidate isn't working, I modify this to "tell me about your last role." If the candidate has never worked in product management and is looking to making a career change, I ask, "Tell me about your ideal role."
The point of this question is to surface their mental model about product management. Product managers come in many breeds. I want to know are you a data-driven optimizer, are you a visionary strategic thinker, are you an Agile product owner, are you a backlog manager? There is no right or wrong answer. In fact, what I'm looking for is always dependent on the type of role I'm trying to fill. But if there's a mismatch, there's no need to continue. So this is where I start.