This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Amino Acids Basics, Subject name: Biochemistry
[{'content': 'Cysteine is synthesized from - \nSelect and explain. \nA. Methionine, B. Arginine, C. Histidine, D. Lysine', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Methionine o The question is very simple.o One sulfur containing amino acid can be synthesized from other sulfur containing amino acid only,o Methionine and cysteine are sulfur containing amino acid.", 'role': 'assistant'}]