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
Ammonia is detoxified in brain to- 
Select and explain. 
A. Uric acid, B. GABA, C. Urea, D. Glutamine
D: Glutamine
Answer: D: Glutamine 
Explanation: The brain is a rich source of glutamine synthase and predominantly detoxifies ammonia by synthesis of glutamate.