You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Tumor with best prognosis is: and explain in detail?
Answer is C (Cerebellar Astrocytomas): Most cerebellar astrocytomas are histologically Juvenile pilocytic astrocytomas. Juvenile pilocystic astrocytomas are benign and non infiltrating astrocytomas with an excellent prognosis (95% 5 year survival with surgery alone) Ependymomas are also histologically benign but carry a worse prognosis than cerebellar astrocytomas with (80% 5 year survival rate) Medulloblastomas and Glioblastoma Multiforme are malignant tumors with a poor prognosis.