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: Unknown
[{'content': 'Hysterectomy from a 35-year -old female showed the following gross and histological features.  What could be your possible diagnosis? \nSelect and explain. \nA. Carcinoma endometrium, B. Leiomyoma, C. Malignant mixed Mullerian tumor, D. Leiomyosarcoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref. Robbins Pathology. 9th edition. Page. 1019\n\xa0\nLeiomyoma is the most common pelvic tumor in women\n\xa0\nSymptoms include:\n\nAUB\nPelvic pain and pressure\nInfertility or adverse pregnancy\n\nGross\n\nSharply circumscribed, round, firm, grayish white, "raw silk" and whorled cut surface\nOften shells out\nBulging and trabeculated cut surface\nUsually within myometrium (intramural), may be submucosal or subserosal\n\nMicroscopy\n\nWhorled (fascicular) pattern of smooth muscle bundles separated by well vascularized connective tissue\nSmooth muscle cells are elongated with eosinophilic or occasional fibrillar cytoplasm and distinct cell membranes\nMay develop areas of degeneration if large including hyaline or mucoid change, calcification, cystic change or fatty metamorphosis', 'role': 'assistant'}]