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': 'Basic amino acid (s) is/are \nSelect and explain. \nA. Arginine, B. Lysine, C. Histidine, D. All of these', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Basic amino acids → Histidine, arginine, lysine (Memonics HAL).\nAcidic amino acids → Aspartic acid (aspartate), glutamic acid (glutamate).\nAll other 15 standard amino acids are neutral.', 'role': 'assistant'}]