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
Which of the following feature of a thyroid nodule on ultrasonogram is not suggestive of malignancy? 
Select and explain. 
A. Hyperechogenisity, B. Hypoechogenisity, C. Nonhomogenous, D. Microcalcification
A: Hyperechogenisity
Answer: A: Hyperechogenisity 
Explanation: The hyperechoic structure on ultrasonography suggests a benign lesion. Malignancies always have a hypoechoic or nonhomogeneous hypoechoic structure.
USG features of malignancy in a thyroid nodule

Hypoechoic / nonhomogeneous / solid                
Microcalcification                                                  
Variable peripheral rim
Internal vascularity
Lymph node involvement