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: Pathology
Psammoma bodies are seen in following except- 
Select and explain. 
A. Serous cystadenoma of ovary, B. Mucinous cystadenoma of ovary, C. Meningioma, D. Papillary carcinoma of thyroid
B: Mucinous cystadenoma of ovary
Answer: B: Mucinous cystadenoma of ovary 
Explanation: Psammoma bodies are concentrically arranged calcified structures,seen in papillary carcinoma of thyroid ,serous cystadenoma of ovary and meningioma. It is not a feature of mucinous cystadenoma of ovary. (Ref:ROBBINS Textbook of pathology)