This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Basics of amino acids, Subject name: Biochemistry
[{'content': "'D'- form of amino acid is derived from? \nSelect and explain. \nA. Produced in liver, B. Break down from muscle, C. From external source, D. Synthesis in muscle", 'role': 'user'}, {'content': "Answer: C \nExplanation: The amino acids which we can be synthesized in our body are always in 'L'-form. So, the source of 'D' amino acids is always exogenous either from diet or from intestinal bacterias. In body all L- amino acids are present and none of D-amino acids except D-serine and D-aspaate in Brain", 'role': 'assistant'}]