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
A 35 year pregnant woman comes graves disease in first trimester. What is preferred treatment? 
Select and explain. 
A. Drugs alone, B. Surgery followed by drugs, C. Radio- iodine ablation, D. Observation
A: Drugs alone
Answer: A: Drugs alone 
Explanation: PTU is given in pregnant woman. Carbimazole is contraindicated.