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
Which end product of the citric acid cycle is used in detoxification of ammonia in the brain 
Select and explain. 
A. Oxaloacetate, B. α-ketoglutarate, C. Succinate, D. Citrate
B: α-ketoglutarate
Answer: B: α-ketoglutarate 
Explanation: First read the reaction by which ammonia is detoxified in the brain.