Antibiotics. He heard they were being over-prescribed. By the time he realized he wanted and needed to take them it was too late and the infection killed him Autonomy is one of my top values, I never try to persuade anyone to do anything, but there won't be any time for him when he changes his mind
I know from talking to people in oncology and palliative care that sometimes we pressure our loved ones to "fight" when it might not objectively be the best choice I promise this isn't one of those situations, we're trying very hard not to pressure and it's definitely the best/least painful choice