Which of the following statements is true about the abbreviation NPO?
A. It stands for noninvasive peritoneoscopy and refers to a method of looking at the peritoneum without surgery.
B. It stands for nihil per os and means "nothing by mouth."
C. It stands for nasogastric tube and refers to the tube inserted through the nose into the stomach.
D. It stands for nothing passes orally and means a patient cannot have food or drink.
Answer: B
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