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
[{'content': 'Glycine is useful in all of the following except \nSelect and explain. \nA. Purine synthesis, B. Creatine synthesis, C. Spermine synthesis, D. Heme synthesis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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', 'role': 'assistant'}]