This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of protein and amino acid, Subject name: Biochemistry
[{'content': 'Glycine is present in \nSelect and explain. \nA. Hemoglobin, B. Gulatathione, C. Purine, D. All', 'role': 'user'}, {'content': 'Answer: D \nExplanation: <p> ref pg no.284, table22.1, textbook of biochemistry for medical students. Seventh edition . for optn A Ref pg no.199,textbook of biochemistry for medical students, seventh edition.for optn B .glutathione is gamma glutamyl cystenyl glycine. Ref pg no.563,fig43.10,textbook of biochemistry for medical students, seventh edition. for optn C.<\\p>', 'role': 'assistant'}]