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: Unknown
[{'content': 'The commonest prostaglandin used for the termination of 2nd trimester pregnancy: \nSelect and explain. \nA. PGE1, B. PGI2, C. PGA2, D. 15 methyl PGF2', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Methods of termination of pregnancy: \nSecond Trimester (13-20 weeks):\n\nIntrauterine instillation of hypertonic solutions\n\t\nIntra amniotic à 20% saline, 40% urea mannitol\nExtra amniotic à Ethacrydine lactate\n\n\nProstaglandins F2a and E2\nOxytocin infusion\nHysterotomy', 'role': 'assistant'}]