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 with double chiral is ? \nSelect and explain. \nA. Phenyalanine, B. Threonine, C. Tryptophane, D. Tyrosine', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Threonine", 'role': 'assistant'}]