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
Normal thyroid weight varies ______________ with dietary Iodine content - 
Select and explain. 
A. Directly proportional, B. Inversely, C. Inverse cubically, D. Not fixed
B: Inversely
Answer: B: Inversely 
Explanation: None