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': 'About peptidyl transferase true is \nSelect and explain. \nA. Used in elongation & cause attachment of peptide chain to A-site of t-RNA, B. Used in elongation & cause attachment of peptide chain to P-site, C. Used in initiation and cause 43S complex formation, D. Used in initiation and cause 48S complex formation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]