This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ectopic Pregnancy (Hello ! Where are you ?), Subject name: Gynaecology & Obstetrics
[{'content': 'Plasma levels of hCG during pregnancy doubles every: \nSelect and explain. \nA. Daily, B. 2 days, C. 4 days, D. 6 days', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In normal pregnancy it doubles in every 48 hrs In ectopic pregnancy it doubles in every 5 to 7 days These occurs only until 7 weeks of gestation.', 'role': 'assistant'}]