This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: miscellaneous, Subject name: Pathology
[{'content': 'The risk of sarcoma developing in a fibroid uterus is approximately \nSelect and explain. \nA. <1%, B. <10%, C. >30%, D. >50%', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Though uterine sarcoma is rare--with the annual incidence of leiomyosarcomas at approximately 0.4 to 0.64 per 100,000 women--it has been estimated that approximately 1:8300 to 1:352 women undergoinguterine surgery for presumedfibroids have unsuspected sarcoma.', 'role': 'assistant'}]