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': 'A 40 year old female patient complains of burning sensation during micturition. Patient gives history of recurrent urinary tract infection. Urine culture reveals presence of E.coli. Which of the following enzyme synthesizes all the RNAs in the isolated organism in this patient? \nSelect and explain. \nA. DNA dependent RNA polymerase, B. DNA polymerase, C. RNA dependent DNA polymerase, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A\xa0single\xa0enzyme-DNA\xa0dependent\xa0RNA polymerase\xa0or\xa0simply\xa0RNA\xa0polymerase-synthesizes all\xa0the RNAs in\xa0prokaryotes. RNA polymerase of E.coli is a complex holoenzyme with\xa0five\xa0polypeptide subunits.\nSatyanarayana- Biochemistry, 3rd edition, pg-542', 'role': 'assistant'}]