This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Physiology
The principle of "Wolff-chaikoff effect" is used in 
Select and explain. 
A. Iodide for thyrotoxic patients after surgery, B. Iodide for thyrotoxic patients before Surgery, C. Stimulation of hormone synthesis, D. Inereased vascularity of thyroid gland
B: Iodide for thyrotoxic patients before Surgery
Answer: B: Iodide for thyrotoxic patients before Surgery 
Explanation: Increased Iodine inhibits thyroid hormone synthesis. This is called Wolff Chaikoff effectRef: Ganong&;s review of medical physiology; 24th edition; page no; 346