This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anatomy
The amino acid that acts as a precursor in the production of urea is 
Select and explain. 
A. Arginine, B. Aspaic acid, C. Ornithine, D. Glutamate
A: Arginine
Answer: A: Arginine 
Explanation: (Refer: Harper's Illustrated Biochemistry, 26th edition, pg no: 265)