This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of protein and amino acid, Subject name: Biochemistry
Urea cycle occurs in 
Select and explain. 
A. Liver, B. Gastrointestinal tract, C. Spleen, D. Kidney
A: Liver
Answer: A: Liver 
Explanation: Inside the cells of almost all tissues,transamination of amino acids produce glutamic acid. How ever , Glutamate dehydrogenase is available only in liver. Therefore ,the final deamination and production of ammonia is taking place in Liver.Which fuher enters Urea cycle.Ref: DM Vasudevan - Textbook of Biochemistry, 7th edition, page no: 203