This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Structure and function of protein, Subject name: Biochemistry
[{'content': 'How do proteins enter peroxisomes? \nSelect and explain. \nA. Folded, using a C-terminal or internal signal sequence, B. Folded, using an N-terminal or internal signal sequence, C. Unfolded, using a C-terminal or internal signal sequence, D. Unfolded, using an N-terminal or internal signal sequence', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Peroxisomal proteins are fully folded in the cytoplasm and enter the organelle in folded form. The most common signal sequence which directs proteins to peroxisomes is a C-terminal Ser-Lys-Leu tripeptide. Reference: Harper; 30th edition', 'role': 'assistant'}]