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': 'Signal peptides are synthesized in \nSelect and explain. \nA. ER, B. Free ribosomes, C. Membrane bound ribosomes, D. Golgi body', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]