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': 'The appearance of markedly vacuolated, nucleated red cells in the marrow, anemia and reticulocytopenia are characteristic dose-dependent side effects of : \nSelect and explain. \nA. Azithromycin, B. Chloramphenicol, C. Clindamycin, D. Doxycycline', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]