What is the most likely reason for having an abnormally high blood urea level?

Question

Quizplus · Accepted Answer

Blood urea is a waste product formed in the liver after the breakdown of proteins and is excreted by the kidneys. A high blood urea level indicates impaired kidney function or kidney disease. Liver dysfunction (A) may cause an accumulation of toxins in the blood, but it is unlikely to increase blood urea levels. Protein intake twice the RDA (C) may increase blood urea levels, but it is not considered abnormally high. Kwashiorkor (D) is a form of severe malnutrition that may result in low blood protein levels, but it is unlikely to cause abnormally high blood urea levels.

What Is the Most Likely Reason for Having an Abnormally