relative clauses - "a patient who is" or "a patient whom is"?



I am still very confused on when to use who and whom, I understand the idea these sentences are correct:




  • He is the person who won the competition.

  • That is the person whom I went on holiday with.



But what would be correct in the following sentence:



This image shows a patient who is... or whom is?



Would it be who because the patient is the subject, or is it?




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