This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
Hydrolysis of which of the following compounds yield urea? 
Select and explain. 
A. Ornithine, B. Argininosuccinate, C. Aspartate, D. Arginine
D: Arginine
Answer: D: Arginine 
Explanation: Arginine is an amino acid that is deaminated to form ornithine primarily in the liver as part of the urea cycle. Ornithine, argininosuccinate, aspartate and citrulline are generated in the urea cycle but do not provide free ammonia for urea synthesis.