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
Therapy of choice for diffuse toxic goiter in a patient over 45 years - 
Select and explain. 
A. Surgery, B. Antithyroid drugs, C. Radio iodine, D. Antithyroid drugs first followed by surgery
C: Radio iodine
Answer: C: Radio iodine 
Explanation: None