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
The main sites for oxidative deamination are: 
Select and explain. 
A. Liver and kidney, B. Skin and pancreas, C. Intestine and mammary gland, D. Lung and spleen
A: Liver and kidney
Answer: A: Liver and kidney 
Explanation: Only liver mitochondria contain glutamate dehydrogenase (GDH) which deaminates glutamate to alpha keto glutarate plus ammonia.
The hydrolysis of glutamine also yields NH3 but this occurs mainly in the kidney where the NH4+ excretion is required for acid-base regulation.

Reference: Vasudevan 7th  ed, pg 202