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
The drugs which can be used safely in early pregnancy to treat rheumatoid arthritis are all except 
Select and explain. 
A. Leflunomide, B. Sulfasalazine, C. NSAIDS, D. Adalimumab
A: Leflunomide
Answer: A: Leflunomide 
Explanation: Methotrexate and Leflunomide are potential teratogenic drugs.