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 does not contain fat on mammography? 
Select and explain. 
A. Post – traumatic cyst, B. Hamartoma, C. Seborrhea keratosis, D. Galactocele
C: Seborrhea keratosis
Answer: C: Seborrhea keratosis 
Explanation: Fat containing breast lesions are Lipoma, Galactocele, Hamartoma, Traumatic lipid cyst (fat necrosis), oil cyst.