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': 'Ribosomes are attached to ? \nSelect and explain. \nA. Nucleus, B. RER, C. Smooth ER, D. Mitochondria', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ribosomes Ribosomes are the actual sites of protein synthesis.The ribosomes are small granules of RNAs.Ribosomes usually occurs in clusters called polyribosomes attached to one mRNA molecule, an arrangement that increases the rate of polypeptide synthesis.', 'role': 'assistant'}]