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 which lacks chirality is \nSelect and explain. \nA. Lysine, B. Leucine, C. Histidine, D. Glycine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The α-carbon of amino acids has four different groups attached to it and so is a chiral or asymmetric carbon.\nThe only amino acid which does not have four different groups attached to α-carbon is glycine, i.e. glycine does not have chiral carbon or chirality.', 'role': 'assistant'}]