Well, when my step father was dying of cancer, his kidney packed up (he only had one) and he was asked whether he wanted it treated or not. Not treating it would have meant him dying. He said he didn't want the treatment, but unfortunately for him, they treated it anyway - the doctor later told him that he was drifting in and out of conciousness and they couldn't make his words out.
So, you can have a choice. But in my step dad's case he was terminally ill. He died a month later anyway.
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