Some people have views of doctors and psychiatrists perhaps in particular where there are these power issues. That is why many are trying to move things away from what is called the "medical model." But this is not universal. My experiences with doctors is positive. The ones I know are humble and genuinely involved with providing attentive care.

Back to the question about questions...I gave a long answer, but I guess the short answer is simply, it is alway fine to ask your therapist any question (ruling out abusive, insulting, and otherwise inappropriate types of things). But asking a question does not mean that an answer is going to result. There are ways that therapist handle this where they turn the issue into one about the very asking of the question so an answer one way or the other doesn't come up, at least not at first.