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'pr' is an abbreviation for which route of administration?

  1. per rectum

  2. prior to rest

  3. patient referral

  4. per rule

The correct answer is: per rectum

The abbreviation 'pr' is used in medical terminology to denote the route of administration as per rectum, which means through the rectal route. This abbreviation is commonly used in relation to medications or treatments that are administered through the rectal route. Options B, C, and D are incorrect as they do not pertain to any medical terminology. Option B refers to rest, option C refers to a referral, and option D does not relate to any medical term.