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 condition does not contain fat on mammography? 
Select and explain. 
A. Hamaoma, B. Galactocele, C. Post-traumatic cyst, D. Seborrheic keratosis
D: Seborrheic keratosis
Answer: D: Seborrheic keratosis 
Explanation: Seborrheic keratosis are the most common skin lesion that is visible on the mammogram. These are benign skin lesions that are associated with aging. They appear wa like with a verrucoid surface, with air trapped in the irregular cracks in the surface of the lesion. Ref: Breast Imaging By Daniel B Kopans, Pages 481-482; Radiology Review Manual By Wolfgang Dahne, 7th Edition, Page 555