This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Gynaecology & Obstetrics
[{'content': 'The drug being given is \nSelect and explain. \nA. Ethacrydine lactate (0.1%), B. 20% mannitol, C. 50% Urea, D. Misoprostol', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ethacridine lactate (0.1%) is used only extra - amniotically.', 'role': 'assistant'}]