This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of nucleic acids, Subject name: Biochemistry
Glycine is useful in all of the following except 
Select and explain. 
A. Purine synthesis, B. Creatine synthesis, C. Spermine synthesis, D. Heme synthesis
C: Spermine synthesis
Answer: C: Spermine synthesis 
Explanation: Spermine is a type of polyamine.This is aliphatic amine and it is synthesized from ornithine. Key enzyme is ornithine decarboxylase. REFERENCE : DM.VASUDEVAN.TEXTBOOK; SEVENTH EDITION ; PAGE NO : 229