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': 'Optically inactive Amino Acid is \nSelect and explain. \nA. Proline, B. Glycine, C. Lysine, D. Leucine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Asymmetric (chiral) carbon is responsible for optical activity.\nGlycine does not have asymmetric carbon, therefore is optically inactive.', 'role': 'assistant'}]