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': 'Smoking causes all except \nSelect and explain. \nA. Preterm birth, B. Pre eclampsia, C. Abruptio placenta, D. Intra uterine fetal demise', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Risk of smoking in pregnancy includes:\n\nPlacental abruption\nPremature rupture of membrane\nSudden infant death.', 'role': 'assistant'}]