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': 'Which of these amino acids does not have asymmetric carbon atom? \nSelect and explain. \nA. Valine, B. Glycine, C. Alanine, D. Tryosine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Glycine is the simplest amino acid with no optical activity.', 'role': 'assistant'}]