This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gynaecological oncology, Subject name: Gynaecology & Obstetrics
[{'content': 'Most common site of metastasis for choriocarcinoma is : \nSelect and explain. \nA. Lung, B. Liver, C. Brain, D. Bone', 'role': 'user'}, {'content': "Answer: A \nExplanation: Spread of choriocarcinoma Lungs 80% X-ray chest, CT Vaginal metastasis 30% Speculum examination, bhCG Pelvis 20% Pelvic examination, ultrasound, CT Liver 10% Ultrasound, CT Brain 10% CT, bhCG Gastrointestinal rare Ultrasound, bhCG kidney, spleen Reference: Shaw's Textbook of Gynaecology 16th edition page no 516", 'role': 'assistant'}]