Brain cancer might be categorized as the worst and the deadliest disease. Approximately 17.000 people in the United States are diagnosed with primary cancer each year and nearly 13.000 die of the disease.
The brain is made up of individual cells. These cells are the smallest units which compose the brain. A brain cancer can arise from any of the cells, which make up the brain. Brain cancer starts in just one cell. As the cell makes more and more copies of itself, it grows to form a tumor. A malignant tumor has a capacity to spread, and is then called "brain cancer"
"Primary brain cancer" starts within the brain, and is the main subject of the transcript. In contrast, "secondary brain cancer" starts in some other organs (like lung or breast) and then spread to the brain. This is called "brain metafisis"
There are several things that have been found to increase the risk of developing brain cancer. Having rare family disease (such as neurofibromatosis, Von-Hippel Lindau) exposure to radiation, and exposure to certain chemicals (like pvc) have been connected to developing brain cancer. The risk is greater if the person is exposed to at a younger age to a higher dose.
Brain cancer can occur because ....
tumor grows in other organs within the body
cells are contacted to radiation
it starts when exposed to radiation
one cell multiplies itself and forms tumor
the metafisis of tumor is to spread in a cell
Berdasarkan informasi yang terdapat pada kalimat ke-5 dan ke-6 di paragraf ke-2, dapat diketahui bahwa sel yang menggandakan diri (multiplies) akan tumbuh menjadi tumor dan memiliki kemampuan menyebar dan menjadi kanker otak sehingga pilihan jawaban (D) adalah yang paling tepat.
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