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: Surgery
[{'content': 'Treatment of stage I teratoma is: September 2008 \nSelect and explain. \nA. Chemotherapy, B. Radiotherapy, C. Surgery, D. Observation', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D: Observation Teratomas are not radiosensitive Stage 1 can be managed by monitoring the levels of serum markers and by repeat CT. Teratoma at stage 2-4 are managed by chemotherapy (Cispaltin, methotrexate, bleomycin and vincristine)', 'role': 'assistant'}]