This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of nucleic acids, Subject name: Biochemistry
[{'content': 'Folding of nascent polypeptide chains is the function of \nSelect and explain. \nA. Chaperones, B. Proteosome, C. Heat shock proteins, D. Ribosomes', 'role': 'user'}, {'content': 'Answer: A \nExplanation: In molecular biology, molecular chaperones are proteins that assist the covalent folding or unfolding and the assembly or disassembly of other macromolecular structures. Chaperones are present when the macromolecules perform their normal biological functions and have correctly completed the processes of folding and/or assembly. The chaperones are concerned primarily with protein folding.', 'role': 'assistant'}]