Not to beat a dead horse, but after having had 10 gender therapist session, and another 4 with psychologists/psychiatrists, I think I have a few thoughts. I went into those sessions wanting to be true to myself. Questions can be answered so many different ways, I think they're just trying to determine what level of dysphoria are you. Remember, you're trying to show them that being you is essential to your health, well being, relieving angst and anxiety associated with be dysphoric.
I think routine questions will be about your past relationships and perhaps your sexuality.
I was asked 2-3x about whether I contemplated suicide.
What if I couldn't go on hormones, for some medical reason, would I still transition?
They wanted to know was I sociable, have lots of friends, family, hobbies, interests.
I found, or thought beforehand they would throw curve balls. Looking back, all I did was just remind myself over and over, that this feels good to be honest and upfront of who I really am.