<prompt> Which of the following is a risk factor for the develoment of Choriocarcinoma?Presence of Lung metastasisOnset following term gestationb-hCG level 40,000 mlUmLNone of the above  <response>: 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 mlUmL 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. 