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What does the acronym 'h' or 'Hr' stand for?

  1. Hydrogen

  2. Hemoglobin

  3. Hour

  4. Human immunodeficiency virus

The correct answer is: Hour

The acronym 'h' or 'Hr' stands for Hour. Option A, Hydrogen, is incorrect because 'H' is the symbol for hydrogen, not an acronym. Option B, Hemoglobin, is incorrect because the acronym for hemoglobin is 'Hb'. Option D, Human immunodeficiency virus, is incorrect because the acronym for human immunodeficiency virus is 'HIV'.