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': 'Senile vaginitis is due to : \nSelect and explain. \nA. Gonococcal infection, B. Cancer cervix, C. Diabetes, D. Oestrogen deficiency', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Oestrogen deficiency', 'role': 'assistant'}]