This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy, Subject name: Pharmacology
[{'content': 'Anticancer macrolide is \nSelect and explain. \nA. Sirolimus, B. Cycloserine, C. Roxythromycin, D. Azithromycin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Tacrolimus, sirolimus, everolimus are macrocyclic lactones or macrolides.Ref: KK Sharma 2nd ed. Pg: 885', 'role': 'assistant'}]