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: Gynaecology & Obstetrics
[{'content': 'The drugs which can be used safely in early pregnancy to treat rheumatoid arthritis are all except \nSelect and explain. \nA. Leflunomide, B. Sulfasalazine, C. NSAIDS, D. Adalimumab', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Methotrexate and Leflunomide are potential teratogenic drugs.', 'role': 'assistant'}]