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: Radiology
Percentage of cold thyroid nodules likely to be malignant: 
Select and explain. 
A. 20%, B. 30%, C. 40%, D. 72%
A: 20%
Answer: A: 20% 
Explanation: Ans. 20%