A type of wave that can be used to clear a blockage from small tubes in the kidney is a the shock wave. Shock wave treatments are used to break up the stones and make it into fragments. These fragments are more easy to remove that the large ones.
I would have to go with B) because the government doesn't do A and C in every place but they do make sure all food products are safe (FDA)
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Answer: Medical oncologist: A doctor who specializes in diagnosing and treating cancer with chemotherapy and other drugs. A medical oncologist is different from a surgical oncologist, who mostly treats cancer with surgery.
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