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
About peptidyl transferase true is 
Select and explain. 
A. 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
A: Used in elongation & cause attachment of peptide chain to A-site of t-RNA
Answer: A: Used in elongation & cause attachment of peptide chain to A-site of t-RNA 
Explanation: None