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
Threonine, while metabolism is conveed to which amino acid: 
Select and explain. 
A. Proline, B. Alanine, C. Glycine, D. None of the above
C: Glycine
Answer: C: Glycine 
Explanation: Threonine aldolase cleaves threonine to acetaldehyde and glycine. Ref: Harper 28th edition, chapter 29.