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You suddenly develop a severe allergy to potatoes
no more crips, chips, mash, hash browns, roast, gratin, jackets, etc etc etc. Eat half a teaspoon (or equivalent) of potato and you swell up and explode and die.
there is a vaccine/antidote thing that will completely cure you.
However there is a 2% chance that you are also allergic to the antidote, and that will immediately kill you too.
do you take it?