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': 'All of the following are methods of Induction of labour except : \nSelect and explain. \nA. Estrogen, B. Oxytocin, C. Stripping of membrane, D. PGE7', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Estrogen', 'role': 'assistant'}]