Scientists have proven that the only known treatment for gender dysphoria is transitioning. Not to say that misdiagnoses happen, but the only way to truly cure gender dysphoria is to transition. Plus, brining it up once I think is actually a good thing. As a trans person, I can tell you that I have directly suffered due to lack of any exposure or knowledge about trans people until I was a sophomore in high school. And so if you therapists asks you if you’ve considered it once, I think that’s totally acceptable. If you’re not trans, say no. If they keep asking or insisting, then drop them. But if you are, somebody actually pointing it out to you could literally be the single best thing ever to happen to you.