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The acronym INR refers to?

  1. International normalized ratio

  2. Intra net routing

  3. Immediate need resource

  4. Test for clotting

The correct answer is: Test for clotting

INR stands for International Normalized Ratio, which is used to measure the clotting ability of blood. It is a standardized test and is used to monitor the effectiveness of blood thinning medication. Options B (Intra net routing) and C (Immediate need resource) are incorrect because they do not relate to the medical field or the acronym INR. Option A (International normalized ratio) is a close choice, but it is missing the word "test," which is an important part of the acronym. Thus, it is also incorrect.