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I refer, for example, to, "In which foods does one find carageenan?" vs. "In what foods...?" Thank you!

  • In which sounds like you already provided an array of options to choose from, whereas in what sounds like an open question. – Qian Chen Apr 3 '18 at 10:57
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That depends on context. If it is understood that one is selecting from a specific list of foods, it would be "which". If the question is open-ended, it would be "what".

These two options make the choice clearer, because "of these" makes it obvious that one is selecting from a specific list:

  1. In which of these foods does one find carrageenan?
  2. In what foods does one find carrageenan?
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