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': 'Thalidomide acts through : \nSelect and explain. \nA. Inhibiting angiogenesis, B. Inhibiting thymidylate synthase, C. Inhibition of Topo–isomerase I, D. Inhibition of Topo–isomerase II', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]