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: Gynaecology & Obstetrics
[{'content': 'Most commonly uterine fibroid presents as heavy menstrual bleeding. Most likely cause is \nSelect and explain. \nA. Hormonal imbalance, B. Dilated endometrial venules, C. Ruptured fibroids, D. Torsion of fibroids', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Dysregulation of local vasoactive growth factors is known to cause dilatation of endometrial venules which causes heavy menstrual bleeding.', 'role': 'assistant'}]