Mark the true and false statement about brain tumors: 1. Most common primary brain tumor is astrocytoma 2. Radiation exposure & genetic abnormalities are the risk factors 3. MEN-2 and NF-1 increases the risk 4. Three cardinal symptoms are seizures, raised ICT & focal neurological deficit 5. Dexamethasone reduces peritumoral edema 6. Primary goals of surgery includes histologic diagnosis & reduction of mass effect 7. Anti-epileptics for tumors close to sensorimotor strip 8. Craniospinal irradiation for tumors associated with CSF spread