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': 'Ectopic pregnancy differs from threatened abortion by: \nSelect and explain. \nA. Minimal vaginal bleeding, B. Pain follows bleeding, C. Uterine size corresponds to gestational age, D. Manifests at an early age', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]