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': 'The sensitivity of mammography is low in young females because : \nSelect and explain. \nA. Less glandular tissue and more fat, B. Young females are less cooperative, C. Young breast have dense tissue, D. Because of less fat content', 'role': 'user'}, {'content': "Answer: C \nExplanation: The mammographic appearance of breast depends on the relative amount of fat and glandular tissue which are present.\xa0Young woman's breast contains a large proportion of glandular tissue which appears as a soft tissue density\xa0and lowers the sensitivity of mammogram.\nMammographic appearance of breast (Based on the relative amount of fat and glandular tissue) :\n\nGlandular breast :\xa0(Dense breast) In young woman, where breast contain large amount of glandular tissue.\nAdipose breast\xa0: (Fatty breast) In older women, where most of the glandular tissue has involuted.\nInvoluting breast\xa0: When mixture of soft tissue and fat density present.", 'role': 'assistant'}]