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': 'Which of the following is a risk factor for the develoment of Choriocarcinoma? \nSelect and explain. \nA. Presence of Lung metastasis, B. Onset following term gestation, C. b-hCG level < 40,000 mlU/mL, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Poor-prognosis patients, based on the Clinical Classification of Malignant Disease, are those with any of the following risk factors: *Serum b-hCG titers greater than 40,000 mlU/mL at the onset of treatment *Diagnosis of disease more than 4 months after molar pregnancy *Brain or liver metastases *Prior unsuccessful chemotherapy *Onset following term gestation.', 'role': 'assistant'}]