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 most consistent sign in disturbed ectopic pregnancy is: \nSelect and explain. \nA. Pain, B. Vaginal bleeding, C. Fainting, D. Vomiting', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Vaginal bleeding', 'role': 'assistant'}]