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': 'Most basic amino acid out of the following is \nSelect and explain. \nA. Alanine, B. Arginine, C. Histidine, D. Lysine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Arginine is the most basic amino acid with pk value of side chain (R) 12.5\nAspartic acid is the most acidic amino acid with pk value of side chain (R) 3.9', 'role': 'assistant'}]