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': 'The following are indications for postoperative radiotherapy in a case of carcinoma endometrium except: \nSelect and explain. \nA. Myometrial invasion of more than half thickness, B. Positive lymph nodes, C. Endocervical involvement, D. Tumor positive for estrogen receptors', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]