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: Surgery
[{'content': "All except one are avoided in Raynaud's disease \nSelect and explain. \nA. Oral contraceptives, B. ACE - inhibitors, C. Beta - blockers, D. Ergot alkaloids", 'role': 'user'}, {'content': "Answer: B \nExplanation: ACE - inhibitors are used in treatment of Raynaud's disease.", 'role': 'assistant'}]