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 ultrasound feature of a thyroid nodule is not suggestive of malignancy? 
Select and explain. 
A. Microcalcification, B. Nonhomogenous, C. Hypoechogenisity, D. Hyperechogenisity
D: Hyperechogenisity
Answer: D: Hyperechogenisity 
Explanation: Malignant thyroid nodule shows marked hypoechogenicity on the ultrasound. Hyperchogenicity of a thyroid nodule on ultra sound suggests a benign lesions. Ultrasound features of malignant thyroid nodules: Vascularity Hypoechogenicity Presence and type of calcification Finding of enlarged adjacent lymph node Smoothness of the border around the nodule Ref: Thyroid Neoplasms By Bryan Haugen, Volume 4, Page 36,7