This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oncology, Subject name: Medicine
[{'content': 'Tumors most amenable (cured with) to chemotherapy. \nSelect and explain. \nA. Chorio Ca, B. Embryonal rhabdomyosarcoma, C. Hepatocellular Ca, D. Thyroid Ca', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Treatment of low-risk gestational trophoblastic neoplasia (GTN) (invasive mole or choriocarcinoma) may include the following: Chemotherapy with one or more anticancer drugs. Treatment is given until the beta human chorionic gonadotropin (b-hCG) level is normal for at least 3 weeks after treatment ends Ref Harrison 20th edition pg 540', 'role': 'assistant'}]