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
[{'content': 'Which of the following does not contain fat on mammography? \nSelect and explain. \nA. Post – traumatic cyst, B. Hamartoma, C. Seborrhea keratosis, D. Galactocele', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Fat containing breast lesions are Lipoma, Galactocele, Hamartoma, Traumatic lipid cyst (fat necrosis), oil cyst.', 'role': 'assistant'}]