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': 'Non essential amino acids are not: \nSelect and explain. \nA. Used by the body., B. Forming part of the proteins., C. Required in the diet., D. Absorbed in the intestine.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]