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
A vitamin B6 deficiency reduces the effectiveness of transaminase enzymes. Which amino acid is formed from transamination of a-ketoglutarate? 
Select and explain. 
A. Glycine, B. Glutamine, C. Asparagine, D. Glutamate
D: Glutamate
Answer: D: Glutamate 
Explanation: Glutamate is formed from a-ketoglutarate by the enzymes aspaate aminotransferase and alanine aminotransferase.