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Which antilipemic drug get rid of bile acids in the gastrointestinal tract and indirectly removes cholesterol from the liver

When a person undergoes root canal treatment or another endodontic treatment: [select all that apply] a.) the inside of the tooth is carefully cleaned and disinfected. b.) air is forced into the canal to stop bleeding. c.) the inflamed/infected pulp is removed. d.) the inside of the tooth is filled and sealed with a rubber-like material called gutta-percha

Which method of administration would result in the highest concentration of the drug in the brain?