This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Proteins and Amino Acids, Subject name: Biochemistry
[{'content': 'Polyamine like putrescine is derived from: \nSelect and explain. \nA. Arginine, B. Ornithine, C. Yohimibine, D. Arginosuccine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) Ornithine* Polyamines like spermine, spermidine and putrescine metabolite are produced from L-ornithine by action of ODC (ornithine decarboxylase).* S-Adenosylmethionine, the methyl group donor for many biosynthetic processes, also participates directly in spermine and spermidine biosynthesis.', 'role': 'assistant'}]