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 common uterine malignancy \nSelect and explain. \nA. Leiomyosarcoma of uterus, B. Endometroid adeno carcinoma, C. Serous Uterine carcinoma, D. Clear cell carcinoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 75 to 80 % of endometrial tumors are type1, which are endometroid adenocarcinomas.', 'role': 'assistant'}]