This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Classification and metabolism of amino acids, Subject name: Biochemistry
[{'content': 'Order of increasing polarity: A. Alanine B. Valine C. Glycine D. Isoleucine \nSelect and explain. \nA. D- B- A-C, B. B- C- A-D, C. A- D- C-B, D. D-A- B-C', 'role': 'user'}, {'content': 'Answer: A \nExplanation: All aliphatic amino acids i.e. Glycine, Alanine, Valine, Leucine and Isoleucine are non-polar. Isoleucine is most non polar, followed by valine. Glycine is least non-polar out of all aliphatic amino acids.', 'role': 'assistant'}]