This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Women Imaging, Subject name: Radiology
[{'content': 'Mushroom cap sign in MRI is seen in:- \nSelect and explain. \nA. IIeocaecal TB, B. Pulmonary endometriosis, C. Ovarian endometriosis, D. Rectal endometriosis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Rectosigmoid endometriosis: - The endometrial deposit on rectum causes proliferation of muscularis propria and the surrounding tissues which is seen as "mushroom cap sign" in T2 weighted MRI.', 'role': 'assistant'}]