Please choose the correct ending to complete the given sentence: Health: [header] How to prevent brain cancer [title] Be aware of your risk. [step] Doctors do not know what causes brain cancer in most cases, but there are certain factors that can increase your risk. Knowing these factors can help you identify your risk and potential symptoms, and get regular checkups.

Ending1: [substeps] When treating brain cancer, many drugs such as the nsaid and warfarin are used to treat several diseases; others are commonly available in medication. Your risk of brain cancer increases if you have two congestive heart failure and is very low at the time. Ending2: [substeps] Before becoming a family member, a medical doctor needs to know about your history of brain cancer. Tests like albumin, methryrodazole, metronidazole, and oxycodone are proven safe for young adults. Ending3: [substeps] It's important to be aware that you might develop brain cancer after taking any other medications. It is important to be aware of the different factors that could lead to brain cancer, and planning your treatment and treatment plan accordingly is crucial. Ending4: [substeps] The main risk factors for brain cancer include age, exposure to radiation, a family history of brain tumors, and currently having cancer that could metastasize (spread) to your brain from another area of your body. The brain, like the liver and lungs, has a lot of blood vessels.

Answer format: ending1/ending2/ending3/ending4