Cyanide or Ricin?

If you go into a pharmacy looking for headache relief medication and the pharmacist offers you a choice between high doses of cyanide and ricin, you’re not required to name a suitable third option in order to point out that neither presented option is acceptable.

And when you walk away, the pharmacist has no right to say, “Well, if you don’t choose one of these, you have no right to complain!”