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
[{'content': 'Amino acid used in the synthesis of purines ? \nSelect and explain. \nA. Glycine, B. Ornithine, C. Alanine, D. Threonine', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e.,Glycine Amino acids involved in purine synthesis - Glycine, aspaate, glutamine.Amino acids involved in pyrimidine synthesis - Glutamine, aspaic acid (aspaate).", 'role': 'assistant'}]