This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fibroids, Subject name: Gynaecology & Obstetrics
[{'content': 'Fibroid uterus is the neoplasm that arises from: \nSelect and explain. \nA. Endometrium, B. Myometrium, C. Perimetrium, D. Visceral peritoneum', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Fibroid (Leiomyoma) is derived from smooth muscle cell rests either from vessel walls or uterine musculature.', 'role': 'assistant'}]