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When "gastr(o)" is used in medical terminology, what does it refer to?

  1. Sugar; blood sugar

  2. Intestines

  3. Stomach

  4. High blood sugar

The correct answer is: Stomach

The prefix "gastr(o)" is derived from the Greek word "gastēr", which means stomach. Therefore, when "gastr(o)" is used in medical terminology, it refers to the stomach. The other options are incorrect because "sugar" and "blood sugar" are not related to the stomach, and while the intestines are connected to the stomach, they are not specifically referred to by the prefix "gastr(o)". Additionally, high blood sugar, or hyperglycemia, is not related to the stomach.