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
Treatment of stage I teratoma is: September 2008 
Select and explain. 
A. Chemotherapy, B. Radiotherapy, C. Surgery, D. Observation
D: Observation
Answer: D: Observation 
Explanation: 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)