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What does 'ad lib' stand for?

  1. activity as tolerated

  2. as desired

  3. arterial blood gases

  4. acquired immunodeficiency syndrome

The correct answer is: as desired

The term 'ad lib' is derived from the Latin term "ad libitum", meaning "as desired". The other options are incorrect because A: 'activity as tolerated' is used in the context of physical activity for patients with medical conditions, and is not an acronym. C: 'arterial blood gases' is a medical test that measures the amount of oxygen and carbon dioxide in the bloodstream, and is not an acronym. D: 'acquired immunodeficiency syndrome' is a medical condition commonly known as AIDS, and is not an acronym related to the term 'ad lib'.