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: Pharmacology
[{'content': 'Which of the following Tetracycline can be used in renal failure wihtout dose adjustment: \nSelect and explain. \nA. Oxytetracycline, B. Doxycycline, C. Minocycline, D. Demiclocycline', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Doxycycline', 'role': 'assistant'}]