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If (and hopefully you don't need to make that choice) the day comes, you will likely find the right choice.
I watched a Ted Talk where a first aid responder talked about how he used to lie to people he knew would not live. One day he decided to tell the truth and he was shocked by the response. All the people he told that they were going to die did NOT freak out. Instead they accepted death and were at peace with it. He stopped telling lies and allowed those about to die to say the things that were important to them; generally forgiveness and something they are proud of and feel would leave their mark.