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': 'Choriocarcinoma commonly metastasises to : \nSelect and explain. \nA. Liver, B. Brain, C. Lungs, D. Placentas', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Lungs', 'role': 'assistant'}]