This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Proteins and Amino Acids, Subject name: Biochemistry
Urea is formed in: 
Select and explain. 
A. Brain, B. Kidney, C. Liver, D. Intestine
C: Liver
Answer: C: Liver 
Explanation: C & A Harper, 26th ed, p. 244 & 25,h ed, p. 319