But even that's not true, because you can consciously decide not to choose either one of several presented alternatives, with the full awareness and acceptance of what that means. Basically you can always add the default case, making it explicit, and explicitly choose it.
Sometimes it's other people that want you to think that there are only two (or however many) alternatives, of which you must choose one; and by not taking any of them, you can assert your own thinking.
Sometimes you just have a small input to some process that other people are controlling, which will proceed without your input. Sometimes in these situations you only have the illusion that you're making a real decision even if you pick one of the non-default choices you're presented with.
Sometimes it's other people that want you to think that there are only two (or however many) alternatives, of which you must choose one; and by not taking any of them, you can assert your own thinking.
Sometimes you just have a small input to some process that other people are controlling, which will proceed without your input. Sometimes in these situations you only have the illusion that you're making a real decision even if you pick one of the non-default choices you're presented with.